I was watching this trailer on youtube:
http://www.youtube.com/watch?v=Ie3mX550N84
And it gave me the thought that if Aang was dead or didn't conseal himself in a massive ice sculpture thing, and grew too be 112 years old, would he search to find the next Avatar??
And on his search, would that Avatar be Katara??? Who do you think would have been the Avatar after Aang, if he did age to 112 years old???