yeah, totally messing around. It's fun to dream even if it's impossible dreams.
I don't see a scenario that involves demolishing the McCasland being at all likely.
I still prefer an on-campus arena though. Study the Moody, it's size/footprint, and find somewhere to put a comparable arena on OU's campus. Be imaginative. Across from the McCasland, you could possibly buyout the couple of houses there and make it work. But like you said, that's kind of a "if money was not an issue" situation.
But man, Gaylord, McCasland, a new arena, and the new football facilities all in the same area = ideal. Parking be damned lol.