That thread post is pretty laughable to be honest.
Half of those teams have never shipped a game.
You won't be able to simply just form multiple studios from thin air, overnight and ship AAAA next-gen games with 80-90+ metacritic scores. Existing studios will struggle with the transition from this gen to next, so I can't imagine an brand new team MS have just formed coming out and owning it in terms of quality and quantity of first party titles.
New studio, first game:
http://www.metacritic.com/game/xbox-360/halo-4
And now its AAAA? What is the difference between AAA and AAAA in the context of 80-90+ metacritic scores exactly?