Actually, Florida is not our biggest competition. The threat of an upstart league in Vegas has been looming for years. There are multiple teams that feel like Vegas would be happy to build ballparks and would encourage more fans. Florida hadn't built a single ballpark between 1998 and 2004. There is an argument to be made that the Tampa Bay area could support multiple stadiums and could turn into a Phoenix-like destination. Phoenix didn't used to have all of the teams. At one point teams played in Yuma, Casa Grande, and Tucson. They've all become concentrated around the valley now. The same thing could happen in Florida. There are 6 teams that surround the bay area in what could be considered a similarly sized area to the Valley. If you look at this
map Then you'll see that teams on the eastern side of the state are in a significant disadvantage. With the exception of the Marlins/Cardinals (who have a 1998 stadium) and the Braves (who play at Disney World) most of the teams on the eastern side will need new stadiums rather soon. If you were to move, looking at a space near Tampa would make the most sense.
The old school thought was to spread out your teams so that your local fan base wasn't spread too thin. What they didn't realize is that over a million people would be coming down year after year to watch this stuff and that an all-in-one location encourages more fans. Consolidation is inevitable in Florida just as it has been in AZ. If the Mets decide they need a new stadium in Spring Hill, there is little to stop a team like the Brewers from partnering up with them for a two-team stadium. Florida is going to HAVE to build new stadiums to keep the teams that they have. When that happens, they will be able to dangle that carrot in front of any Central Division team. As long as the park's location is close to Tampa, there won't me much of a difference for the team.
I just don't think Florida has the money. They are worse off than we are.