Hmm, I'm with Plum on that, I guess a 3D Origins/Legends would probably end up similar to the classic Crash titles, except with less box bashing. I feel that if a new 3D title came out, it should evolve and fuse concepts from all the sagas, rather than just the UbiArt saga exclusively.
Though as I've blabbed about before, I'd love to see a Metroid inspired Rayman game, I think the progressive gain of powers and linked backtracking and locating of other item boosts (for instance, Cages give health in the 3D titles, but in Rayman 1, you couldn't get them all first time, and some required clever platforming. Seems like a good analogue for the E-Tanks, eh?).