Only because the desktop market will shrink.

I think most people's computing will go to phones, tablets, or phone/tablet-like devices (like Chromebooks or the Macbook Neo) that don't really count as desktops. I think the PC hardware market will shrink.

What's left will be PC enthusiasts and gamers clinging to their existing hardware, and TBH I can see 15% of those moving to some linux flavor as Microsoft basically sunsets desktop Windows.

Business workstations will be stuck with Windows forever, though.