Why should Nintendo keep Wii U alive until November 2017?
The console has been irrelevant to gamers; even if it's making money on it now, if you take out the R&D spent on the console, marketing over the years, how much of a profit will it have made in 2017?
The longer Wii U is around the more Nintendo risks facing irrelevance in the home console segment.
Nintendo needs a stronger source of revenue - as it is it's core focus.
They need NX to do that and most importantly to make amends with it's fanbase and be taken seriously again by gamers.
E3 last year showed pretty well that even if they have projects coming this for Wii U, those will be kept at a minimal. Had they any intentions of keeping it alive until 2017 and E3 2015 would have been a repeat of E3 2014. It wasn't.
You don't support a failed system more than you have to. That's how business is done.
NX will be presented and launched this year because that's the best way to hype people for a console that normally you wouldn't look twice.
It worked really well for Sony and MS, why not for Nintendo?