Linux is still half-baked. I can see additional software moving to the Mac, but not Linux.
You haven't tried out any of the Linux releases recently if you believe that.
The 'puter I'm on right now has W98, XP, Mandrake, Fedora, Suse on it, and I often boot up with Knoppix readonly from CD. Mostly using Fedora - my daughter prefers that.
Very seldom use XP any more. Love LINUX --- no problems at all.