Just keep in mind that widespread Linux adoption means it will lose something special it has had from being relatively small on the desktop. This would be another Eternal September ... including a massive influx of entitled users and all that.
Because of that effect, I think there needs to be one or more for-profit Linux OS vendors prepared to absorb all the support and feedback needs (and contribute upstream, of course), and OEMs should only use it/them for anyone besides "advanced users and developers" or similar verbage.
SteamOS maybe?