I want to see V3 be more of an interaction between four elements - the player, POPs, characters, organizations
So that you know what I'm talking about:
1. the player - an idiot behind a monitor with a keyboard and a mouse with enough knowledge of history to know that France and Germany are not the same place
2. POPs - just as they are in V2, on the whole; population groups organized by wealth, religion, culture, etc.
3. characters - less detailed than CK2 of course, with exact detail depending on type. Types include major landowners, CEOs of corporations, hereditary nobles, military generals, labor leaders, politicians.
4. organizations - combination of characters, POPs, and, depending on the organization, factories and/or RGOs.
How do these guys all interact? Well, every RGO and factory that exists has a name and an "owner" character, which is nothing more than a name, culture, religion, wealth character, personality type. Connected to every RGO/factory is its workforce. Depending on circumstances, these RGOs/factories may gain enough money to purchase another RGO/factory, and if it does, then it will create a corporation, taking a name from a tag-specific list. Every corporation contains a CEO, which is a more fleshed-out character, a board of trustees (4 characters like the original "owner"), and its workforce. Without diving into the gritty details, every RGO/factory supports the corporation, and the corporation supports the factories/RGOs, and it will decide where/when to build more factories or buy them or even close them, and when large enough, can even expand overseas. To keep things fair, a corporation will only focus on one kind of "product" at a time, although it can purchase/build the factories and RGOs needed to make that product; to prevent frequent product-switching which would prevent other corporations from rising, product-switching results in some penalties to production and other elements for a few years. The actions of the CEO determine what the corporation does, the CEO is determined by the Board of Trustees, and the Board of Trustees is determined by the stockholders.
Additionally, all corporations sell stock in the country's stock market. Any POP or organization with stock gains a percentage of the annual unused profits of the corporation; normally, the corporation itself will hold 25% of its own stock to allow it to money to spend on factories and other things. Corporations can also hold stock in foreign countries, and the government can hold stock in its own internal and spheres' companies. If the stockmarket crashes, however...well, there's a reason that triggered panics and depressions.
Furthermore, every country has one or more banks, which loan money out to governments, private citizens, and organizations. Middle and upper-class POPs and characters, as well as some organizations, will sometimes decide to speculate in the stock market, buying on credit. Any POP with excess money will probably invest some in the local bank. Banks can also loan money to other banks, allowing another possibility for a chain reaction in the market. Banks are also run by "owners."
Railroad companies - I'm not quite sure how they'd be down, but probably a similar system to factories/RGOs, as well as naval shipping companies.
Not-for-profit organizations that span the globe such as Churches would also be modeled in a way that would not effect the economy much (besides providing some service to the poor maybe) but would impact the government. Labor unions would also be modeled in a similar way, I would assume.
Other miscellaneous characters would be characters with noble titles (in countries where they exist, even if they're powerless), major intellectuals, and miscellaneous politicians.
And now, how this all relates to politics. Every country has political organizations, which are not allowed to buy stock and do not sell stock. Every POP and character has a set of political beliefs, although in POPs they will change over time based on circumstances, which impacts which party and ideology it supports. A party's stances and ideological trends - it no longer has a set ideology, but rather will evolve over time - affect the characters that will be up for election and how elections pan out. Again, I don't have a definitive idea in mind, but how it should work is the voters and characters of a party in a province/state lend their political viewpoints to its candidate for national offices, a process that would also be affected by things such as the boss system, spoils system, and other methods of corruption if they exist...and the goal would be, they're not necessarily bad from the player's perspective, they're just how things are. A new party arises not at set dates but when criteria are met (which may be a set date after all) or militancy levels, CON among a particular POP (US Populists depend on CON and MIL among farmers), reform desire (US Progressives), issues (US Republicans - slavery), or other things. Things that affect elections would be the parties' budgets (based on donations from supporters), the issues of the population at large, and other things. Basically, the goal should be that the political landscape changes over time, because the parties aren't trying to uphold a particular set of ideals, they're trying to get elected. When there is no majority, parties will maneuver to form coalitions to get themselves at least some say in power.
How does this interact with the player? Well, for starters, the player gets a say in how parties evolve through election events - but rather than focusing on provinces or states, they focus on national party conventions. Additionally, the player can encourage certain industries in the economy, as well as encourage foreign investment, stock market investment, buying on credit, the purchase of land, etc. At the same time, however, the makeup of the upper and lower houses - as well as the character of the President/Prime Minister himself - influence what you can do, as they affect budgets, military spending, industry, social services, and even whether or not you can go to war. Simultaneously, though, you can influence the government - either through election events, encouraging certain issues, or by using a national focus on a particular governing body directly.
Thanks if you happened to read this wall of text, and let me know what you think.