Farsala on 02 May 2016
I actually like the March launch as long as they save some big guns for the holidays. Launch windows will always be bare, so it hardly matters that they are launching alongside big games. Otherwise a holiday launch would be the worst idea, and clearly it is preferred. If NX can hype people up for the holidays then they should be fine.
Basic plan in my mind:
March: NX launch with Zelda
Summer/ September: Decently big game
Holidays: Big 3D Mario game to show off the systems potential
