We've only seen new airbenders come from the Earth Kingdom. Why? I know the the Earth Kingdom has the greatest amount of nonbenders but the Water Tribe and Fire Nation have nonbenders too. It seems like there are about 30 new air benders at the most; that's a good start, but it barely fills one temple.
Do you think there are/will be new airbenders in the Fire Nation and/or Water Tribe? If so, will we see them next season or maybe in a comic after the series is over?