I'm more interested in how many nowaday units should be in mod. Like I'm not fan of 35 nations, but I can survive it, I also don't think that giving ten types of airplanes, ten types of infantry and ten ships classes both to West and East is the best way...
I'd say the priority land unit classes should be:
Modern Armor
AFV (New Class, default mechanized infantry, but now counts as armor, not gunpowder)
Jet Fighter
Stealth Bomber
Marine
Anti-Tank
SAM
Paratrooper
Gunship
That's nine classes, only one new. The change is simply due to my irk at the default use of the mechanized infantry. It doesn't make sense to give a vehicle infantry combat attributes, even if it functions as an
anti-infantry weapon; a vehicle cannot, for example, fortify a building.
However, seeing as we're starting at 2008, it's likely a lot of futuristic tech will seep in later in the game, so eventually we might want to include other classes. I figure I want the Next War units, maybe some Final Frontier space fighters, and a Ghost class unit.
Now, one thing I think we need to replicate the global situation more accurately is an overhaul of the economics. Among the things we need:
*Diplomacy should allow leaders to exchange resources for gold-per-turn or vice-versa.
*The inflation rate-difference of countries determines how much it costs to spread a corporation in them. For example, if Country A has a bigger economy than Country B, then it is cheaper for Country A to spread its corporations in Country B, and more expensive for the reverse to occur (I know inflation exists in the game already, by the way)
*A few "industrial" corporations should be added. Cities they spread to can build goods-factories, instead of just the default branch. Goods-factories, as opposed to simply upping a city's general production, instead give their cities several occurences of resources, like the Broadway, Hollywood, and Rock & Roll wonders currently do. This is where the previous two things come in handy. You can replicate global economics by paying very little money to spread a corporation in someone else's city instead of your own, and then paying a bit for the products. Outsourcing.