Not going to happen any time in the foreseeable.
What I, and most business and professional users, use the full version of Windows for, can't be done, and will never be done, on a tablet. It's not an appropriate physical vehicle for that kind of work. And that market is Microsoft's core.
OTOH, if all you're talking about is email, web surfing, some powerpoint, light wordprocessing, and tiny spreadsheets, sure, you can squeeze that into a tablet.
Tablets are terrific for lightweight communications and media consumption. And the app market has exploded with thousands of handheld applications that nobody foresaw even 5 years ago when the iPhone came out. But the point it, you don't need full-blown Windows for that.
I do not believe that installing a full version of any real operating system on a tablet will be effective use of the resources. The stripped down version is fine, for what tablets are best at.
That's all IMO, of course. :) YMMV.
Agree. Tablets aren’t supposed to take the place of PC’s (desktop or laptop). They are for different purposes. I use mine for the typical (email, web, photos, video, news - via RSS and apps, note taking, and some other functions specific to my job). I am a very heavy user of Excel with enormous financial models, macro’s, database links, etc. That stuff cannot, and should not, be done on a tablet. It would be miserable. Different products for different purposes.