I think a duel track version ala S:TE or Gemini, along with slightly higer capacity trains would be the answer to high capacity, plus make the ride even more fun.
I don't think parks would want people slapping hands at 100+ mph, though. I was just thinking, I'm not going to speculate where it is going to go, but I read an interview with Stan Checketts and they asked what was next for the TA2K after Hypersonic. He said they were currently working on one that would go slightly over 100 mph (Fujikyu Highland), and soon they would start work on one that would go "WAY" over 100mph! Excited? I know I am!
-------------
- Peabody