It seems to me that the silence over the last few months must have been because they changed direction. I'm guessing the the .NET to WinRT was the hold up and they wanted to see if they could do it before they announced it.
the only thing I can think of that would keep .NET from being embraced by consumer windows is if there are security flaws in .NET apps. And I don't know enough to say that or not. But Windows 7 and earlier PCs are way too much of a hassle for users in terms of getting viruses.