I for one believe it will make all but the cheapest tanks a rarity. I am also worried it will make mortar teams all the more decisive in the hands of high APM players, which scares me.
A lot of the current problems in the game right now stem from artillery spam, and I think something needs to happen before Tactical games can really be enjoyed.
Increase arty aim time, reduce reload speed, decrease arty accuracy, decrease demoralization. Any one of these could improve the situation, but I think Eugen knows this and will take the right steps to correct it.
From past experiences. People will take whatever they feel like regardless of what other people take.
You will have some that go arty only, others that buy the most expensive unit they can afford because they then think they will be indestructible and kill everything while only having to micro one thing.
Then you will get the guy who tries to play properly, buys a bunch of cheaper units that work together.
The people that get the super expensive thing, will usually rage quit and leave the game as soon as they lose it.
The arty guys will just buy more arty, and if losing will wait till the entire front line is gone and their arty is about to die, and then they will leave.
The proper player meanwhile will desperate struggle to fill in all the gaps in the front line.
Match is decided most time not be the actual points, or even the end of the game allotted time, but by leavers.
The side that wins is usually the side that has the least amount of "early leavers"
Every leaver is less micro on your side, and the more points per tick to the arty player to just buy more arty or planes, which means the frontline guy has to spread his share of the extra points over more and more territory.
This is also why you end up with one side stacked with players who do this a lot and play with each other, and the other side completely randoms.
The leavers ruin it. Large scale tactical is a good idea, that often gets ruined by people being selfish and stupid who can then immediately quit when it goes bad with zero consequences and jump straight into another match to do it all over again.