I believe much of what you are suggesting would run afoul of anti-trust / monopoly / anti-competitive legislation on the basis that MS is still largely in a dictatorial, monopolistic position wrt the PC market. Basically MS is not allowed to force the hand of independent publishers due to their dominant position in the market.
Then again, if MS started being too big of an arsehole twoards the likes of Valve, perhaps Valve would then start supporting alternative platforms more, and put most of their games on Linux. Which would then greatly help me to de-Miscrosoft my life completely. The only reason I have Windows hardware is for the gaming.
As to the question of this being the last Xbox console. It is possible. There's not much strategic value in consoles any more. MS recognised that and tried to position Xb one as an alternative to Apple TV (and similar set top devices) with it's early focus on the non-gaming entertainment side of Xb one. But they failed to recognise that non-gamers, if anything, are put off by the thought of being associated with a gaming brand. If MS wants to pivot to multi-media set top box dominance, they are both too late, and lacking in a brand that has any appeal outside of a minority of the gaming community. So now they are back to trying to increase it's share in gaming, which is really a strategic distraction because it just allows Apple and to a lesser extent Google/Android to own set top box multi-media entertainment even more.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
