If Microsoft is really this dumb they are dooming their platform already. Imagine all those people that spend 500$ bucks on their unlocked phones or on a 2 year contract?
If they find out they will not be upgraded to Apollo, which was probably the only reason they went with WP7, to be able to be on the platform of the future for Windows, they are seriously going to get mad. I mean, really mad to the point they will never, ever again come back to Windows Phone no matter how great it will be in 2020.
This means that Microsoft 2% market share in the phone will drop to 0.1%, they will basically have to start from scratch with Apollo. All this people that like their Windows phone which are lacking in serious features like no VPN, no teetering, etc only went this route because they thought its going to be the next thing and now they find out its was only a temporary OS until the real OS was out.
Also the Metro thing works fine and nice on a tablet and phone but it seriously sucks in a PC for work. If Microsoft dares to actually kill their only market share that is using Metro this will actually kill Windows8 and Windows Phone all together because this people will become MS haters once betrayed.