Imagine they release all the games they should release this year
2015 Kirby, Mario vs Donkey Kong, Mario Party, Mario Maker, Splatoon, Devil's Third, Xenoblade, Star Fox, Zelda.
How many games would they have left?
Pokken Fighters, an Animal Crossing, a Paper Mario, a Fire Emblem, or at least Fire Emblem x Shin Megami Tensei, a Punch Out, some sports game like a Mario Strikers, a Metroid (which could be for the next console), they haven't done an F Zero or Wave Race since the Gamecube, perhaps some japanese game ported to the west like Fatal Frame, perhaps a new Pokemon Snap.
Even if the Wii U begun to sell well they would have to release a new console in 2017 because they dont have enough games to support a console for more than 5 years. This is a problem also because I think people after the PS3 and 360 gen expect their consoles to last considerably more than 5 years. If Nintendo consoles are to last only 5 years, then they have to be very cheap imo.
I think in the next gen Nintendo should let other companies make "Nintendo" games, let Capcom make a Nintendo vs Capcom game (they want to do it), let From make a Zelda game, let Sega make a new F Zero, get them to make a New Monkey Ball game too.
BTW, I would love a new F Zero or Wave Race with online play.