While I may not be in the target audience for a subscription I'd still like to voice my opinion on the matter
While I am personally against subscriptions, at least how they are implemented for everything these days, I understand why some may like them and choose that path, and that is their choice and I respect it. However, if the goal is to bring in new players to the game, simply throwing together some sort of weekly/monthly/yearly or whatever subscription is not the path I would take, though I am a consumer and not the seller so the point of views are different. The common complaint about the price of all the content together being too high is reasonable, and Paradox's argument of frequent sales are too, remember that most people, I don't have numbers but I would imagine it'd be this way, buy through Steam, who takes 20-30% of the profits. One would also point out however, that the prices of older DLC AND the game have not dropped in value despite being older products, a common trend in physical content that appears to be dying for digital products.
Now personally, I'd rather the first few DLCs and some mechanics from the latest DLCs to be added to the core game, not only would it make consumers happy with more content being stored into the base game so less need to buy expansions, but also help the developers be able to flesh out those major mechanics even more. EU IV, and other PDX games but mostly EU IV, have a problem of reworking major mechanics or implementing new ones which is great, but locking it behind a DLC causing issues. You can't add to it anymore because you're making DLC for a DLC, and you can't make major changes again because people bought it and you might accidentally make the mechanics less impactful and causes consumers to feel like their money was wasted. EU IV seems to have a problem choosing what is in the update and what is in the DLC. If we look at Dharma, government reforms completely changed the system, and for the better, but now it means the old system is pointless and people feel the need to buy it. Considering how important government is for your country, imagine if a shooter game released an expansion that completely reworked the shooting and and was so much better and everyone who already bought the game gets the new DLC and is happy, the new people who pick up the shooter a week or so later, but no the expansion, go "why is such a major mechanic locked out for me after I bought a full game, now I have to go dish out more" and it might turn them off from the game.
What Paradox and many other companies in my opinion have forgotten is the base game is suppose to be just as playable, DLC is suppose to expand upon the features/mechanics/gameplay of the base game. Now pardon me for the game example, but if I go out and buy Call of Duty, I know I'm so sorry, and buy a map pack DLC, it doesn't change the core game while it expands what I already have by giving me a larger map selection. Now I'm not saying I want Paradox to stop adding major mechanics in expansions, but what I'm trying to say is core features should only be touched for free updates, as well as some huge QoL mechanics like province control, to me it's embarrassing that was a DLC feature and it took so long to be added to base game. For example with Dharma, I would've made the government rework as part of the update, but because I'm focusing on India, add some in depth reforms for the Indian nations with unique mechanics to make them stand out from the other nations and their reforms. By doing this, you keep your base game playable and you EXPAND, not replace, upon your core features.
So, how many copies of your base game do you sell? It's been out for almost 7 years now, it's a strategy game on PC, you can't attract new people, maybe reduce the price of it by 25%? I highly doubt EU IV base game is a big money maker still. Take core feature rework and mechanics that were introduced in DLCs and add them to the base game. Now I'd rather all DLC up until start of 2018, I think 2 years is more than enough time to make your profit, be incorporated into the base game, but if you absolutely insist on still selling them, have their price reduced by at least half, permanently. As someone said earlier, introduce a "life cycle" of a DLC, give it 2 years where it's standard release price, then after that it drops by 50% like the older DLC already would be. Stop selling major reworks, let the base game and game with DLC FUNCTION the same, and focus on making DLC that expands on your game's features on introduces new smaller interesting mechanics that aren't so crucial. As much as I hated pirates being added to the game, that system is good for an expansion to me, you're adding a new way to play the game, but not changing the core game. Rework trade, naval combat, land combat, government, religion and whatever else, but everyone should be on the same page for these important mechanics, leave special units, new small ways to convert land or move trade power around to your expansions. If you reduce the cost of the base game by 25% and all the DLC pre-2018 by 50%, for me the cost becomes $164.85, that's not counting all the DLC released in 2018 to today. Now while that may look much better than what it is now, remember that someone new might see that and still flinch, this is why you make the base game playable. So people here in Canada, if the cost was reduced by 25%, can buy the game for $33, reasonable for a good 7 year old game, and try it out for what it almost is like today then decide how they want to expand their style and slowly pick and choose different expansions.
At the end of the day, I believe Paradox dug a grave with it's DLC policy when it meant to dig a garden. While it initially was making money, helping the company grow, enabled lots of post-release support and opportunities for more and better DLC, they just kept digging instead. Now with the idea of a subscription, you realized you're in a grave and want to get out, so with your shovel you start to dig but this time to the side to make a tunnel and hide the problem that still exists, you're stuck in a hole, this time the hole is the price to own the base game and it's expansions. The thing with the DLC being released it constantly is it made it feel like a tax, "Ah look, Lord Paradox has sent his servants to support us but we must pay our bi-yearly tax" instead of "Oh damn this is a fun game, I'm going to buy this DLC to make it better". Come on Paradox, even Activision lowered the price of the older Call of Duty games on Steam, don't let Activision look better than you.
I hope I was able to make some sense in this, it's 1:40 in the morning and I am very tired.
P.S. NO EXCLUSIVE DLC FOR SUBSCRIBERS