@Hearts_Are_Cold: The Air Acolytes are merely taught the ways of the Air Nomads by Tenzin. That's all that's been revealed about them.
@Miss Vern and Breezes: I think that Breezes' theory is logical, but I'm not getting my hopes up. You would think that if there were still air-benders around, they would have possibly been found along with the colony of sky bison. But there is a possibility that the surviving air nomads were so terrified by Sozin's committal of genocide on their people, that they cut off all contact with the outside world permanently and hid themselves away, and have yet to come out of hiding.
Aang was supposed to be the last air-bender, and that was supposed to make people sympathize with him and his ordeal. The air-benders are going to be repopulated, though, thanks to Aang and Katara having Tenzin, and Tenzin having his three children.
Breezes mentioned that it is possible that humans may have the ability to learn how to bend. That is possible. Perhaps something like that will be revealed later in the series. If Amon has a way to take a person's bending away, then there's most likely a way to get the bending back. Or there couldn't be. Dunno, we'll have to wait. Though in my opinion, it's highly unlikely non benders have the potential to bend, because if everyone's able to bend, there's really no point to the whole plot of Avatar: Legend of Korra.
Meh, to sum up my post that probably made no sense at all, it is very possible that there were air-benders that survived the Fire Nation. It's not completely out of the realm of possibility, so I wouldn't say the thought is wrong. I will say, however, that people should just watch the show and not get into arguments about this kind of stuff.
Wait and see what the show says. Theorizing about stuff is fine, but when you try to pass it off as the absolute truth, you only make yourself look like a meanie.
...Don't hurt me? sweatdrop