That's a valid point. They would either continue on their trajectory towards more platform unification/features or they start focusing on first party again.Nowhere have I stated that I assume MS works the same way as Sony. But given everything you state in this very post about MS' experiments, why would you have any faith in them doubling down on first-party software development after they're done with XB1X?
If anything, after years in the console industry, experimenting in first-party developed and funded software, all they have to show for it is Gears, Forza and Halo, then why would you expect at all that Spencer would be able to see a bigger budget for game development approved at the corporate level? Certainly, the opposite is more likely?
At the moment I would have assumed they would start to go back, but you're right that I see no reason for them to go back on that route either.