Not sure they have the studios for that.
While they have like 20 studios it isn't really possible for them to put big AAA games every year. Plus half the studios are AA studios, Undead Labs, Ninja Theory, etc.
A game takes roughly 4 years. Then like 2 years for decent, worth while sequels. That doesn't even factor in Bethesda, who make huge RPGs . I mean how old is Skyrim now? Still years away From a new ES. And these usually take up multiple teams.
Even with Acti/Blizzard on board, I don't think a big game every 3 months is realistic.