Miriam Adelson is pretty insane and not a hoops fan, her late husband Sheldon was. She's a "cheap billionaire" who follows weird conspiracy theories and most 100% definitely did not want to be on the hook for the Super Max with Luka. I'd bet money she will try and move the Mavs to Vegas in the next five years. She's going to wreck that team, like Donald Sterling level bad!
I still think some kind of franchise swap is more likely than a move. The value of the Vegas expansion is going to be $5billion +.