A retheme is very unlikely at the moment for the Florida ToT. I would expect the Paris Tower to be rethemed first before I would worry about the DHS Tower, but there is many more reasons that it would be more difficult than the DCA Tower:
1. Audio system needs a complete reprogramming, the last thing Disney would want is for a new ride to have messed up audio.
2. New Drop shaft motors
3. The Hollywood Tower Hotel sign has all of the camera equipment on it, meaning they would have to build a new platform for the camera system if the sign were to be removed.
4. Holiday projections would have to be remade or relocated.
5. Starfield Doors would have to be replaced by something else. They are not only for show, but to also hide the backstage equipment.
Besides, in January I got word from a coordinator that there is still plans for new show effects and drop sequence(s) with the existing theme.