Actually, if Wii U had been a success, we'd probably be seeing its successor by the end of this year, giving Wii U a 6 year lifecycle. Its failure cut less than two years from its life. Nintendo likely would have saved the next big Mario game for the successor to Wii U or they would have gone the Galaxy 2 route and created a direct follow-up to 3D World. A game like Odyssey doesn't serve Nintendo very well on Wii U in 2017, even if it's a big success.
Yo guys, this is a bit confusingMight be off topic in a way, but I hope Nintendo keeps pumping out new i.p. like that. Splatoon 2 is the biggest reason I ordered a Switch(can't wait for it to get here). Mario, Zelda, MK, Smash, etc. will always be safe bets. Splatoon came out of left field imo.