I hate to say it, but many of you are still dwelling on the "why it won't work", stuck in linear paradigms. Nobody told the engineers at Disney that they could not accelerate from 0 to 100 in 260 feet with the Tower of Terror. Nor could they accelerate from 0 to 60 in 2.8 seconds from a horizontal start. But they did. Could similar approaches be used? Obviously, one would have to slow down the acceleration for the faint (feint?) of heart.

All I'm trying to say is that you can't just point out the negatives. That is just as bad as the snake oil salesperson that only points out the positives. Just look at China, and the high speed rail system they are putting in. Google what folks were saying just 10 years ago about it, and now it looks like it may be done by 2019, a full year ahead of an aggressive schedule.
Think out of the box, or all the roller coasters will look the same!