Which 6 cities to add in order to un-lopside the leagues?

I think this is the second time I've seen someone mention Salt Lake City as a relocation for MLB. Can I ask why? SLC doesn't have the population to support a team, that would be by far the smallest market in the game. SLC as a city is the 127th largest city in the nation and the 48th largest metro area. There is no way it would work and neither would Las Vegas, people go to Las Vegas to gamble, not to watch a pro sports team. Baseball is fine the way it is, I would relocate teams before expansion. One team I would move right now is the Oakland Athletics, another one being the Tampa Bay Rays, I'd leave the Marlins in Miami though. But honestly I would leave baseball as is. My possible relocation for the A's isn't far from where they play now, I would suggest either San Jose or Sacramento, I know San Jose is the Giants area but that can be dealt with. For the Rays I'd move them to Charlotte, NC, both teams would remain in the same divisions.