Microsoft and Windows (and by extension x86) achieved their desktop market dominance by respecting that most people want backwards compatibility.
Everything that has tried to go or is going against that tide either failed (eg: Itanium, Windows RT) or never had market share to lose in the first place (eg: MacOS, Linux in the consumer space).
Microsoft would be stupid to be "courageous" and drop backwards compatibility, that would even trump Apple's courage abandoning the headphone jack. It also makes business sense to keep your eggs in multiple baskets, assuming those baskets are each commercially viable.
Everything that has tried to go or is going against that tide either failed (eg: Itanium, Windows RT) or never had market share to lose in the first place (eg: MacOS, Linux in the consumer space).
Microsoft would be stupid to be "courageous" and drop backwards compatibility, that would even trump Apple's courage abandoning the headphone jack. It also makes business sense to keep your eggs in multiple baskets, assuming those baskets are each commercially viable.