Selling their services and software matter the most to them, so I don't see how returning their first-party games to true exclusives or timed console exclusives would benefit them.
The Xbox Series is on the path to outsell the Xbox One by a notable margin, but I don't see it touching the Xbox 360.
Xbox is in a better spot right now than it was in 2013-2016.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima