Nintendo is being reduced to tripping over itself after mishandling the 3DS launch. This is actually kind of sad to see. I don't think the 2nd analogue stick is that big of a deal, especially if Luigi's Mansion 2 plays fine without one, but it would've been nice to have. An attachment would just be uncomfortable and adding one to a revised model would be really unlike them.
I don't think Nintendo has too many options right now, but pumping out dev kits and riding out this **** storm seems to be the best bet.