You do realize Crystal Skull has the second highest box office behind Raiders right? I wouldn't call that poor. If you meant critically that I can understand that a bit more but it still did well with critics and audiences for the most part. Plus I doubt that was more important to them than box office returns.
While another ride would be great, the Paris coaster would not be my first choice due to capacity. Unless they did a double track like Primeval Whirl. I much rather them add a different ride type in addition to the stunt show.
I don't think you understand what timeless means...
Nothing screams timeless like Nazis and 1930's technology.
I think the word you are looking for is "iconic".