Think: genuinely challenging AI. Games as a whole will never fully flourish until they can really sort out the AI, which has never been managed, especially on a complex game like TW. Games are graphically 'based' at the moment, the things that will happen when people really start to look into the mechanics, I'm pretty convinced will have the power to melt your face, particularly with something like TW.

Also I remain to be convinced of the value of 'moving on' from the 'swords and spears' style. Few games cater for this well (how awful is AoE), and TW does it very well, it doesn't need to have any kind of generic strategic setting in WWII etc. There's plenty of history to go around, most of it occured before 1914, contrary to popular belief.