Though, honestly, that is what you want on a Platform Exclusive. You WANT people to wish the game was on their platform. It wouldn't be a good exclusive otherwise.
Too bad Rayman poisoned that well now, now every third part exclusive will be met with reaction: "i'd rather wait till it'll be released on Xbox/Playstation".
I think a more relevant example would be Ninja Gaiden: Razor's Edge, which Nintendo published and was supposedly a Wii U exclusive...until a few months later when it was announced and released on the 360 and PS3.
I just don't see the point to buying a 3rd party game on Wii U unless it is
iron-clad, 100% exclusive to Nintendo. Because if it's not, it can and
will be ported to the other platforms, where I do the overwhelming majority of my gaming anyway. From the looks of things, Bayonetta 2 is staying w/ Nintendo, so
if I like what I see from Bayonetta 1 (assuming I ever get around to playing it) I won't be waiting for some mythical port of the sequel a half decade later.