Posts like this are SMH material...
First there is no rumored 3DS redesign, that's just speculation, hardly a rumor; it has been said multiple times that the battery would suffer more than it's suffering now and R2/L2 buttons are basically impossible to add if you want to keep the device portable. We could speculate that Nintendo may release a 3DS XL Hardlycore edition of the handheld that may include the Frankenstick, but that is not a rumor, it's a theory based on nothing.
Second, I can't even begin to understand why would you prefer playing on a VITA than on a 3DS with Frankenstick, from a comfortable standpoint. You should realize that the VITA lacks the R2/L2 buttons, and no, the back touchscreen is not an acceptable replacement, in fact, there is no game that mimics those buttons on the back touchscreen (that I'm aware of, maybe someone thought it might be a good idea, but all I've seen is replacing those buttons on the front touch screen, probably because of accidental pushes of the bts).
Also you have the ergonomics to take account off, the Frankenstick is infinitely more comfortable to hold than the VITA or 3DS.
Last, you may say that you prefer the VITA analog sticks because, you know, they are analog, but maybe you don't realize that the camera of MH games is digital and not analog, so you don't benefit from the extended movement of the stick, maybe in new games from that series, that will change, but as of now, there is really no benefit in having analogs, I'm willing to bet that the game will be more comfortable to play without the Frankenstick, using the on screen camera; just like MH Tri Wii was more comfortable to play with the Wiimote+nunchuck. The Frankenstick was made because of MH, but that doesn't mean it plays better with it, it's something to please older fans of the series.
I also don't agree with your "oh, this game is popular, I must play it" attitude. MH is not Angry Birds, it's a game that's good when played with friends and better locally, it's demanding of your time, it's difficult, it's difficult to begin, etc. Maybe you should look for a cheaper way to play a game in the series to understand if it appeals to you or not, the game has been released in most platforms anyway (PS2, Wii, PS3 (jp only), Xbox 360 (MMORPG), PC (MMORPG), PSP, 3DS even iOS has one (spinoff), DS and VITA are forever alone).
[/rant]