Eh, exactly how is the ICS problem going to be fixed easily?
AI and diplomacy can be adjusted, and build times can be dramatically lowered (though then we need more buildings and lower maintenance). However, I am not seeing a simple solution to ICS at all.
1) Increase food/strategic resource yields, increase production yields in mines with tech (already done in mods)
2) Reduce TPs to 1 gold (already done in mods)
3) Make CSs give you a percentage bonus to your own culture/food production in a limited way rather than gift you stuff for free.
So that a maritime CS gives you % bonus to food production in cities, rounded down.
And cultural CS gives you some small % bonus to culture production in cities (NOT TO THE TOTAL), again, rounded down.
(not to the total, so that you'd have to specialize some cities to be culture spots, which again refuses ICS viability)
That way you have to again specialize your cities and give them unique strategies.
Also, you don't get a ton of free food for nothing and your ICSs cant grow without producing REAL food (the core of the ICS strat)
Also, you don't get magic culture, but again, have to produce real.
Also, production becomes a bigger focus than purchasing (Because of the tile/improvement yield changes), which in turn promotes the creation of bigger, better placed cities.
This setup still promotes expansion, as a CIV game should, but more thoughtful and planned expansion now.
ICS fixed.