I may be in the minority, but I wouldn't wanted it changed significantly. It's a great ride and one that people talk about no matter their age. If I was a power to be, it would still be a rebuild but these are the things I would do:
1: Update the building and bring it into code (if it's out of code now).
2. Expand the building to include an indoor queue section. It's one of the only rides that can operate in any weather, but you have to stand out in the weather to get to the ride.
3. Update the ride system so you can have longer trains and increase the capacity.
4. Keep the main story and layout, but update all the effects and scenery.
5. At the burning bridge, update with a track drop.
6. Return the broken bridge effect, but add a decent drop (precursor to finale).
7. Update the train with a realistic train effect (not just a light).
8. Update the final drop to include a slightly longer coaster section.
Just keep it mainly a dark ride with some coaster sections, not just another indoor roller coaster in the dark. Also if you wanted a backwards section, instead of dropping under the train, maybe you could come to a stop right before hitting the train, then shoot backwards....
Jay