I think out of the three big developers the one more capable to handle its own system is EA. And very few peolpe would buy an EA system, packed with all matters of DRM, Day 1 DLC in all 1st parties, not allowing second hand games (if they had their system you know this will happen)...
An Ubisoft console would use AC as their star franchise (yearly releases between main series games and spinoffs, maybe an Assasins Just Dance?).










