No, because a lot of Windows 7 users would buy a new PC anyway in time, as costs continue to go down, and specs continue to go up.
There will be the die-hards who hang on, like people who have black & white TV's, but most people will update when they would have updated anyway, and switch to Windows 8, and the rest will simply install Windows 8 over their old OS.
Personally, I have reluctantly adopted Windows 8, and I would have XP back in a heartbeat if they would continue to support it, but I try not to be a Luddite.
I have got mine behind a Shell interface, which means my 8 operates as close to the way my XP did as i can get it - no 'touch screening' for a start!.
I still run XP on an old laptop simply to run my CD label printing software - not compatible with Windows 8 surprise surprise, and I get a rush of nostalgia when XP opens up.
Next, I'll be wanting steam trains back on the West Coast Main Line!!!!