Same with Soarin'. And as far as I've seen, they are still flying over California at the Land.
The plus side to Midway Mania as opposed to Star Tours and Soarin is that it is all animation and programing that would only deal with on screen elements. No filming would have to be done. They wouldn't have to reprogram the movements of the cars at all. Heck, they could probably use the same programing used for the current games and just swap out the layout/characters/animation. Instead of throwing rings, now you are throwing wreaths...or something.