A lot of teams would say "Our stadium is too small."
There's a reason that, every time someone mentions LA getting a team, Jacksonville is listed as a possibility. Honestly, I think it's a transient Florida thing. People move from cold weather to FL. It's not like they've followed the teams down there their entire lives. If you move to MIA from NY, you don't become a Dolphins fan when you rooted for the Jets your entire life.