It's a shame so little of the original remains, but if it was not possible to keep it, then really all that's happening is what happens to most wooden coasters, the timbers are replaced. There's probably not a single piece of original wood left on any of the old wooden coasters, it's just getting done in one go lol!
I think it's a shame because it will ostensibly look new, but then that may actually draw in a bigger crowd.
The best that can be done now really is for them to rebuild it as true to the original as possible.