Nonsense!
A screensaver could provide for that extra dash of custom Mario flavor on one's machine. Not neccessarily a TMK screensaver, but at least a Mario-based one. Besides, I truly don't see how it'd be any more ludicrous than, say, Mario desktop themes (which, by the way, TMK has.)
Maybe it could be similar to a game demo, with Mario running around a random level... hmmm.. that'd be odd.
Aid