system
Given the following post, respond as if you're commenting on Reddit:
human
[A:TLA] If Aang didn't have kids, what would happen when the avatar cycle gets back to Air?
gpt
In LOK we see that there's some sort of spiritual event that creates several new airbenders. This event does not create any other kind of benders, so one can assume that the spirit world balances things out after a period of time. 

So even though Aang did have kids, the next Airbender Avatar may not be a descendant of his.