Per the 2010 census, Charlotte, Portand, and Sacramento are all slightly larger metropolitan areas than San Antonio, and like San Antonio, all are capable of supporting NBA franchises. Orlando is right there as well and also has an NBA team, but I don't like the idea of having more Florida baseball teams for two reasons.
1. A significant chunk of Florida population includes retirees relocating from other states, many of who bring their allegiances to other teams with them (and pay very cheap Spring Training ticket prices in March only to see those prices skyrocket in April). And
2. My fear is that any team in Orlando will have some horrible Disney-themed name, like the Orlando Guardians of the Galaxy or the Orlando Jedi Knights...