This is actually a great idea, and has been mentioned previously for a variety of WDW attractions. The problem is just how to fit a typically slower paced ride experience into the existing capacity constraints of the attraction. A slower moving ride vehicle will delay everything behind it, backing things up and reducing the hourly capacity of the attraction.
That said, you
might (and I emphasize
might) potentially get away with such an option with Tower of Terror, but I'm quite certain its not nearly so simple (or inexpensive) to implement as it appears. Rather than making a series of drops/ascents in the shaft, the elevator car would spend the same amount of time making one slow descent. That may solve the capacity issues, but I don't know that even that would make the experience tame enough to open it to everyone with no height or physical restrictions. Again, its not impossible, and it would indeed open up the attraction to a lot of people who are now excluded (which should be a very important consideration), but no matter how good an idea it's a bit hard to see the executive ranks at Disney ever getting behind such a concept.
I must admit I'm puzzled by people's objections to such an "alternative ride experience" concept. The current Tower of Terror "thrill ride version", for example, would in no way be compromised by a properly implemented slow-ride option (essentially a 'dark-ride' attraction).
I don't see any reason why they have to dumb down their other thrill rides for a few people.
How exactly is a tame or slower-paced attraction experience "dumbed down"? Indeed, while anyone (Six Flags) can do a thrill ride which goes fast (unthemed roller coasters) or flips and spins you around until you puke, a more sedate attraction such as The land or Spaceship Earth I would tend to rate as more intellectually or emotionally thrilling, not less so.
I would also say that between young children, seniors, those with health considerations and maybe those who just prefer a more sedate experience, far more than a few visitors are excluded from thrill rides at Disney (typically more so than most any other theme park). Rather than a "
relatively small number of parkgoers", many visitors would appear to prefer less thrilling attractions; There's a reason WDW parks aren't overflowing with thrill rides - you have to consider the audience.
That does not mean there is no place for thrill rides in a Disney park, but the very worst thing you could do would be seperate attractions for children ("kiddie-rides"), thrill rides for teens and young adults, and dark rides for families. Disney is supposed to be about theme-park attractions which the whole family can experience together. So - again - how exactly is making an existing attraction more
accessible to the entire family a bad thing?