Honestly March is way too awkward a time period, I mean sure it's the best after winter, but a march release pretty much guarantee's low momentum for console unless it's a lightning in a bottle which is unlikely. They're better off releasing in winter again using E3 2017 to hype the console and consolidate all launch and post release titles.
Would they be willing to go another year and a half of selling nothing but amiibos and a few 3DS games though?