It's a depressing stadium not convenient to downtown. I hate that stadium. I usually don't even watch on TV the Nats game there.
People say fans just don't go to sports in Florida but I don't think that's true. The Heat, Magic, Lightning, Panthers, Dolphins, Bucs are fine attendance wise. The Jaguars struggle but that franchise feels broken, similar to the Rays and Marlins.
I think the relationship between Tampa and the Rays is broken. I wonder why Orlando doesn't make a play? Smaller cities, but would be one of two major sports franchises versus one of three in Tampa. I almost wonder if the state of Florida would help them move there to avoid losing a baseball franchise.
Can't say I've done too much research, but I'm surprised you haven't seen a city like Raleigh or Salt Lake City make a huge move in recent days with Rays looking homeless. They're both growing cities with a well back NHL/NBA team. You don't need a shovel ready stadium.
I'd list Nashville but, to their voters credit, they've seemingly said no to being bilked for another stadium after the Titans got their ridiculous deal