I don't know how necessary this whole thing will be to getting Majora's Mask on the 3DS, but I fully support their efforts. I feel like it would kind of be a crime to bring Ocarina of Time to the 3DS like they did without its sister (I don't know why the game's female, haha). All things considered - what Aonuma said about fan demand, and how they can bring over assets from Ocarina of Time, etc. - there's really no reason they can't or shouldn't do it.
Some people express the concern of this delaying an original Zelda game for the 3DS, and while I share this concern to some degree, I'm also willing to wait a little longer to complete the Hero of Time's story on the 3DS first. Because it should take less time, and should logically be developed by Grezzo as well rather than by Nintendo directly (although I think they had some input before, and this is likely to happen again), it shouldn't take very much development time away from the new game at all.
Majora's Mask is a wonderful game, even better than Ocarina of Time in my opinion, and I'd love to see it in the absolutely beautiful graphics of Ocarina of Time 3D and in portable format, which as suggested by Aonuma fits very nicely with this game.