If you remove the Squier from the picture than it opens the door for Ubisoft to state loud and clear in their marketing campaign that they alone support "Real Guitar" for game play. It would be hard to refute without the Squier. Regardless of how the Mustang can be used as a MIDI controller or that the YRG can be used through an amp or that with the right tools and know how you can use any guitar to play RB3, the competition and the general public will still think that RB3 is just another "pretender's" game.
Even if Ubisoft fails with their bid with the rocksmith game, the meme will be out there that RB3 is just another make believe fantasy game and that is damaging to the franchise.
The token of a real stringed guitar is essential for marketing as far as RB3 is concerned and not in the past tense. It needs to be something readily available for the duration of the PRO MODE as long as HMX pumps out DLC.
EVEN IF THE GUITAR REMAINS HARD TO FIND DOMESTICALLY OR INTERNATIONALLY THERE STILL -MUST- BE A GUITAR TO BE HAD.
I used all caps there because I cannot emphasize that point too highly.