I think giving back their bending it's a bit too easy, I mean, giving everyone their bending back with something magical or anything else sounds a bit to easy, what I would love to see is Lin going into some kind of trip to get her bending back (if we can get her speaking with her mother the way Aang did with the other avatars that would be just epic), something to re-discover her own abilities and maybe reconnect with earthbending, then the others could now