Fair point, for now. But Chromebooks can access Netflix, so there's no reason why this can't be extended to Chrome on Linux in the near future.
> Or play games.
Steam for Linux and Steam OS (which is a Linux distro) will change this. Already pretty much every upcoming indie game is being developed for Linux in addition to other platforms, and there's already a substantial library of games.
> Or have any unsupported peripherals.
Very few of those exist nowadays.
> Or want to use any commercial consumer software.
And what 'commercial' consumer software are you talking about? Most software nowadays can be accessed through the browser, quite a bit is spreading to Linux, or there's an acceptable free substitute. Don't tell me a free office suite with Linux isn't compelling to the average consumer, especially now that sending documents as PDF is more socially acceptable than sending Word files...
I mean, I use Ubuntu exclusively, all native apps, while attending University, developing pet projects, and doing normal 'computer' things like using Skype, playing games, etc... I recently bough a Fujifilm X-A1 camera (great device BTW), and GIMP even works great for importing and developing RAW files...
I don't see what more the 'average' consumer needs - and don't say MS Office or Photoshop, because the vast majority of people don't 'need' them...