Next Totalwar Is...

[biguth dickuth]

Ugh no - this would make TotalWar into an RTS, which is probably anathema to most people here. I personally need time to think whilst I'm planning my next move (and I don't want to have to keep pressing pause).

I would surely support the inclusion of a speed-slider in the campaign map with which you can slow down the game as much as you want, even to "real" time (a game minute per minute). This way you'll have enough time to think of your next move without pressing the pause button. Besides, thinking between turns, like we do in end-turn games, is like pressing a pause button and freezing time, making our moves and then pressing for the time to continue and reveal us the outcome of our strategies.
A "constant-time" campaign map (i don't want to call it "real-time"... ), like the one i'm suggesting, will give a more "real" feeling to the game and therefore make it better, in my opinion. Check a game called "Europa Univeralis" to see a system similar to the one i'm suggesting.

As per RTW.

No, actually RTW has provinces and although you can move your armies freely inside them, you have to conquer their city in order to aquire them. Also, the troop-training and the profit making aspects may be city-related but they are actually also province-related since there is only one city per province. As you can see, the province system has not been completely abolished.
I would rather have no provinces at all, just cities and their areas of influence.

These will add more depth to the game, but may make it too complicated for the average player - some reviews have already complained that RTW is too complicated.

Then the success of "Civilization" which includes these socio-politico-economical factors up to some point should really seem odd to these reviewers.