As RUSH is the first of its kind, it's more of a 'test ride'! For example, Top Thrill Dragster was the first of its kind and that kept breaking down, now Kingda Ka (made by the same people) does'nt break down as much because they have learnt from their mistakes (but they did'nt take those mistakes on board when they built Stealth)!
I don't think that a hotel is a good idea! This is simply because the park is not big enough. Only massive parks like Universal Studios and Disneyworld can get away with this and they don't need a water park to sustain guests. Would'nt it be better to fill in the lakes and build more thrill rides and roller coasters rather then spending money on a hotel which won't attract many guests. A hotel is a BAD idea!!!