Because it would be hilarious. That's it.
Pac is reshuffling the chairs on the deck of the Titanic, they deem UNLV not quite worthy...yet, and suddenly they are gone to their dreamed of promised land.
I might never get off the internet if that were to happen.
Is there any other good reason to add the Rebels? No, there is not, but can't good old trolling comedy ever be the reason for conference realignment? I say yes.