Look at Musk and Vegas. The vast majority of mass transportation in Vegas should be handled by actual public transit, most likely high speed rail from LA and light rail along the Strip to downtown Vegas and a few other places.
Instead Vegas has a silly monorail, a few buses that don't even get dedicated bus lanes on 8+ lane stroads and something stupid like, dunno, 20 daily flights from LA. Plus Musk setting up tunnels or hyperloops or other stupidities.