With internalization, among other factors, the talent pool is bigger. And plenty of kids play ball; there are lots of them getting signed every day.
Portland would be one city; the AL needs a fourth Western city. I wouldn’t touch Vegas. I’d LOVE a third New York area team. (Before moving the Expos to DC, according to the Washington Post, MLB was also negotiating with the New Jersey Sports and Exposition Authority.) And I know of a city up north that has a metro population of about 3.5 million and has a big ballpark just sitting there. Those are a few possibilities.
New teams mean a lot of money in entry fees. That would be good for MLB’s economy.
The Carolinas might be a good market also.