Well i cant say that i want TW series to go "old school", but most definitely i dont want it to become RTS.
I mean RTW is many times more complicated and advanced (and i dont talk about graphic) then STW or MTW.
Its just CA decided to build kids game on top of this incredible engine.
Look at EB and you can see that you can build very nice game on top of RTW.
I would like all next version to be more complicated, more advanced.
For example adding supply element and attrition to armies, much more advanced population element (dividing poplulation on wealth classes, tie unit recruitment to appropriate wealth class, no more recruiting peasants and knights from the same pool). More advanced building options (and more logical, you dont have to stick to one level of building per one level of city thingy).
BI faction rebellion for All factions would be nice, especialy if they could put more depth into it.
Generally i would like TW to evolve to more complicated, advanced faction simulator and not into RTS like game.