Wasn't Eben hinting at something last week?
They should. Plain and simple.
While I personally hate using Windows, I have been trying to get family members to update their machines from Windows Vista, and they won't because "new machines are too expensive and their computer works fine", and despite my best efforts, I cannot get said family members to let me install a Linux on there.
A Raspberry Pi is cheap enough that I might be able to swing them to using something a bit more modern.
EDIT: Not 100% sure why I'm being downvoted for this. Clearly I didn't realize how slow Windows would be.
More like the right desktop to make a patient person desperate
The original Pi was just a little too underpowered to use as a desktop. You could get Chromium to start, but it would be swapping almost instantly and slow to an absolute crawl. The Model 3 has just enough oomph to do basic web browsing or run Libreoffice. It can open Facebook, although you probably don't want Libreoffice open at the same time if you do.
I've found Windows 10 to be slow on more capable machines (older low end laptops mostly), especially ones with spinning hard drives, so I'm somewhat dubious about using it on a Raspberry Pi.