The Oakland A's are possibly very close to moving to Vegas as well, and I think they are at least one of the rumored sites for MLS expansion. I think the NBA will happen it is just a question of when. Amazing when not that long ago they didn't have any professional franchises.
Because the main "draw" of Las Vegas is gambling,
leagues didn't want any of their teams in that city, or associated with gambling.
Every casino in Las Vegas has a sportsbook.
Enter all of the off site on-line gambling sites like "FanDuel" and "Draft Kings", etc that opened up sports betting to the entire country, removing the negetive thoughts of any professional team being in Las Vegas. You can make bets on your cellphone from any place in the country. A lot of folks even make bets while at work. How convienent.
On-line sports betting is here to stay.
These cities had better start treating their baseball teams right, or like the Raiders did, they'll move. Vegas would welcome a MLB team with open arms. What better way to grow the local economy than with the addition of a MLB franchise? It would be childs play to build a state of the art 45,000 seat baseball stadium in Las Vegas. The Raiders and the Rams are the only NFL teams to leave a city for greener pastures, and later return. The success of the Raiders and the Sparks are not going unnoticed by other professional sports.