OK, so let me just point out a blindingly obvious thing that everyone on the internet (and Nintendo) are seem to be oblivious to:
The PSP versions of Monster Hunter are some of the best selling games in Japan, they sell systems, they are the sole reason why the PSP dominates in Japan and Japan only YET:
THE PSP DOES NOT HAVE A SECOND ANALOGUE STICK.
(The PSP has the exact same button layout as the 3DS, the only difference is that the d-pad and sticks are flipped)
So remind me again why Japanese people would ever need a 2nd stick via a massive add-on to play this game?