It can take 10 years (2 AAA games) for a new studio to become really good and recognized.
The main issue is that this studio will be under the same supervision. The supervision which caused Fable Legends, Scalebound, Sea of Thieves... With the fantastic "All multiplayer, game as a service" philosophy. Remember, the Scalebound devs explained that they didn't plan the game for multiplayer and MS insisted to put the focus on it instead, which destroyed the game...
They need to change how they see game development first if they want to make great games. Because they have studios already, but not one great homemade AAA this gen except maybe for some annual Forza. And I mean great as "on the same level as Uncharted 4, Horizon, God of War, Bloodborne"... Or BOTW and Mario if you want to see even higher. If they don't change anything and just add a new studio, it will just make one more "pretty good" or even lower "okay" AAA every 3/4 years, nothing outstanding.
But obviously, it's still a nice first step.







