Not just that, but they also don't want to run the risk of the game losing "perceived value" by not gaining traction on a troubled platform.Well, obviously. They don't want to spend marketing dollars two times(and one time on a semi-dead console) when they can spend it just one time to sell the game on a much larger combined userbase. This is the only reasoning behind the delay for the Wii U's release, that I can see.
Presumably, their original intention was to stagger the release on multiple platforms, but Wii-U panic has set in. They don't want to damage the Rayman brand by setting it adrift.
But, man, must it suck to be that dev team. I really do feel badly for them. And part of why the team would be so public about their displeasure is so that fans don't think they're a bunch of a-holes. The prior game succeeded because of the fans, even when Ubi sent the game to die.