I am a really big fan of base building in RTS games, which is why I never liked Starcraft. Bases in Starcraft feel like they have such little rhyme or reason. They are messy and ugly. I always build a ton of bases in games like Tiberian Sun, that, while gameplay wise, are a waste of time and money, feel fun to build and fun to defend and destroy. I think a really cool strategy game idea would be a logistics themed game. One where building more realistic bases all over a map is a strategy so that they can supply and support each other. Maybe you start out with a FOB and you need to expand into guerilla held territory, but you need to build COPs and Logistics centers to keep your troops supplied and protected.
I always hated in Starcraft how clicks per second is a means to measure how effective some one is at the game. I really want to see a game where tactics and unit composition matter, where a platoon of mechanized infantry face off against like a BTR platoon and, using strategy, you pull through. Have each squad with a realistic composition of like a Squad leader, 2 team leaders, a radio man, 2 squad weapons, a crew served weapon, 2 anti tank units, a combat life saver, and 2 rifle men. I think something with that depth, but with a more coherant interface than like Shockforce, and with pausable real time combat would be awesome. Like Arma but an RTS.
What games would you want to see?