You could certainly say that about desktops already. You could, but you'd be pretty wrong. My mum has a PC, my dad has a PC, my computer illiterate sister has

You could certainly say that about desktops already. You could, but you'd be pretty wrong. My mum has a PC, my dad has a PC, my computer illiterate sister has a PC, my brother has a PC, my 9 year old nephew has a PC, my (non-geek) friends have PCs, my colleagues have PCs. And, since personal expamples aren't proof, just look at the size of the market, it's far from being a niche. Argue the case that desktops will become obsolete, but that certainly hasn't happened yet.