I just can’t see the NFL approving a team in Vegas. A major headache for the league is keeping the players out of the sort of trouble associated with nightclubbing, gambling, etc. (cf. Manziel, Johnny). So, you’re going to spend season after season flying whole teams into trouble’s way? Don’t think so.
I think an even bigger problem is water. Vegas has a huge water shortage and will get worse if a team and thousands of workers who come with it. A ton of mansions will have to be built somewhere.