An enterprising fan, however, beat them to the punch. The Molten Core ATARI-style game is now available, as posted in the forums. You can download it from Box.net or from Filefront. Design inspiration is credited to Blizzard, of course, but its graphics, programming, and game play are courtesy of Derek Gallant.
With this morning's server restarts, I took the opportunity to fire up this 1 or 2 player raid instance. And, while it probably won't be peeling me away from the zombie invasion, I didn't stop laughing the entire time. Derek's creation allows you to play each of WoW's staple classes, and everything is, indeed, fairly reminiscent of Molten Core. (If you know what you're looking at.)