Why would I ever need to buy a new PC?
If my current computers don't break, why would I ever need to ever get another Windows device?
It's an honest question. I am a PC enthusiast and have a SB Core i5 with 2 SSDs, a GTX460, and 16gb of ram. I also have splashtop which I use with my Nexus 10. I attach a bluetooth keyboard when I need to type but I don't see any reason for me to ever buy another laptop or PC.
Moving forward, I would be missing out on more things by not going Android or IOS than by buying a Windows device. There hasn't really been any big traction for tier 1 apps in the Windows store and everything comes out on iOS first.