> It won't ever reach that level.

A bold claim! I can't be certain either way but Linux has gotten so much better in terms of usability in the last 4-5 years for newer users.

Both my parents and in-laws had issues with Windows, they are up and away on Ubuntu for the last year and I've never had to solve any issues for them with it.

My colleagues that use Macs cling to the old ideas that second monitors, hibernation, gestures, compatibility is poor on Linux whilst ignoring the same issues they have with more recent version of OSX (wifi dropping, failure to sleep).

If Linux Distros can keep improving I think they'll have a small shot but I wouldn't go far as to say that shot is impossible.