There is just a little problem, IMHO. While AI countries will implement different policies in a historical way (shifting focus from trade to warfare, and from naval to ground), human players would be more likely to focalise on a single area, to get a large advantage in the most critical point and to crush every enemy, gainig resources that will allow them to catch the others in other areas. An example: a landlocked country with a bunch of leaders (say, Russia, Austria, Poland or even Prussia/Brandenburg) will develop a juggernaught army, crush the neighbours and grab a lot of wealth in the hand of a decent player, while the AI will probably not be so able to exploit this strategy.