I think it'd good to have on every platform. Obviously, Wii U is the most natural choice. However, at the same time, a lot of gamers who played Banjo on N64 when they were little now have Xbox's and PS4's, so it would not be a bad idea to have them there.
However, I think the team should make Wii U a priority. Just my opinion. The Wii U hardware can be particular, yet its the most appropriate platform for the game IMO so it should be kept in mind throughout development. (and plus, it it's not on Wii U, I'll have no place to play it