I can see it used if pre installed on Lindows $200 PC,like wal mart sells,for 3d world ctys or just cheap ,simple use but no way is it going to be a threat to Mac or windoze for masses! That's not the only market for Linux. I'm running a 32-node Linux cluster with parallel DB2, Parallel Batch System, X-CAT, a parallel file system and other high-performance goodies. Try doing any of that with MacOS or Windows.
That sounds like a pretty intense setup. What do you use it for?