I want to consider what this split would be though.
Because we have:
Single-player
Side story/mini games (Checkers, ludo, whatever ACIV had)
Multiplayer
Cinematics
Mobile spin-off game
Mobile app
AC Initiates website (Seriously, it's a beast of a site and only growing)
And then you have all the different platforms, AND assuming this includes the rumored AC:Comet.
Plus, any exclusive side-story DLC (Like Liberation/Adewalé) which are nearly full games in their own regard.
Each studio could dedicate themselves to just one of those.