Should point out that Win8 has over 120 million active users. Not saying that every one of those people love the tile interface, but it's not exactly the bomb you think it is.
Also, as rolfwind pointed out, many mobile devices are reaching PC levels of resolution. Obviously the bitdepth is quite a bit higher, and you can't expect UI elements that work on the desktop to work on mobile (and vice versa), but actual screen resolution is reaching parity, and is certainly not "several orders of magnitude" different.
Finally, I think you will in fact find that convergence will occur, simply due to convenience and economics. I see no reason why an 8 inch device or higher can't use a desktop OS, a la Win8 tablets. Smaller devices like phones are perhaps a different story, but Windows Phone 8 is already using the WinNT kernel, with it's own UI on top. It can work; there will be growing pains, but it does make sense eventually.
Might want to lay off that hyperbole sauce.