Stu has already put 20 million of his own money into the Trop. Also, any of the money they are making on the team is in an account that is going to be used to re-sign Scotty, Delmon, etc. and also get FA's. Thing is, he would not have put 20 mill in it already if he was going to get a new stadium soon. He will get a new one and he may pay for it by his own means
That is great that he has already spent big time money on the Trop, but he needs to spend a bit more and make it even more fan friendly. Use Disney World, the beach, the college students down there in April, whatever he can use to make the Trop a much more inviting place to sit and watch a ballgame. The Devil Rays even if they do become a dynasty in a few years, will struggle for fans to some extent just due to everything else that Florida has going for it, and also the way they were run in the 90s will not be forgotten by some fans for a while. Basically for the Drays to flourish, there has to be excitement at the ball park to go along with excitement with the team that Upton, Crawford, Baldelli, Kazmir, Niemann and many others will provide.
I guess in the end it all comes down to how badly he wants a retractable roof.