Let's all now buy WoW and join Johan's guild..
The only thing I fear is that all the mentioned games whose features will be in EU3 require quite a lot of micromanagement. I do hope there will be some smart auto-micromanage options for brides and educations (or education being skipped to character will entirely) if CK character tree makes it, same goes for Victorian leadership.
Too many features can lead to game be unplayable due to vast amounts of micromanagement you need to play out full possibilities.