Game consoles have been around as long as, if not longer than, personal computers. For the past 10 years straight, the top selling games have been...computer games, like WoW and the Sims (and Myst, before them).
Distributed source control is not the end all of programming. At best, it's a niche. Real companies use commercial source control systems.
Name one major game coming out next year that uses OpenGL. PS3 games don't count. Can't think of one, can you?
BTW, last month, Windows Vista shipped more copies than OSX sold in its entire decade-long run. So...Windows is not likely to become irrelevant soon.
As for fun...Clicking the pretty buttons to close windows may amuse folks of a simpler persuasion, but I find it more enjoyable to play actual games on my computer.