Will the game adress the fortunes of war and peace that can reflect good or/and bad on a nation? Like devestating plauges,drought and so on.Many nations/cultures in history have balooned and the shrunked and even disapeard. Can you as a player/Ai bounce back from devastating losses of land/pop?

It doesn’t look like it will, but it could.  If you had penalties when you moved into an era with more stars than the minimum it might be doable.

I would assume that the ebb and flow of nations would come to represent themselves in the game without requiring mechanics in place to help it - as long as the AI could keep up (which is a pipe dream) and the game doesn't have glaring issues with balance, it's entirely possible that there will be wars and peace which see certain nations rise and fall - it would just take some strategic decisions to force the rising nations to fall. That, and it doesn't quite feel good to be told by the game that you were too good and deserve punishment.