Pretty obvious really. FPS are among hottest third party genres currently and a core element of online activity. FPS is better with two sticks. Case closed.
Note I'm not saying I even want to play FPS on a handheld, but the second nub is there for FPS (and to a sl.ightly lesser extent TPS in the form of shooters like Uncharted).
Does 3DS need one? Not really given the current library. But vita has one to get CoD, etc. and if Nintendo want's to compete in those genres having an inferior control scheme isn't the best idea given how winey, fussy and annoying FPS/TPS shooter fans can be.
BTW I do count myself in that moaning crowd. I'm not sure I would play a FPS on the go, but if I was I'd only play if the handheld had two sticks.
Try to be reasonable... its easier than you think...
