Whether they fit geographically is not the hurdle that matters most. The hurdle is whether they have 32 viable markets, at all. There are 3 markets barely holding on in the current situation. Pittsburgh, which was barely viable late in the Three Rivers Stadium era, before rebounding with a perfect ballpark and then a decent run of success, are starting to show cracks again. Talk of expansion is most likely just another way to try exploiting current team local governments into building new stadiums.