This is great! It does make you wonder though, what did they talk about? What would they have done if Korra hadn't come? This conversation is certainly as good as anything else they might have discussed.
Aang, Sokka and Katara all went on life changing journeys with Zuko. Aang went to the fire temple to met the last dragons, Sokka went to the ATLA version of Alcatraz to bust out his dad, and Katara went hunted down the man who killed her mother. Toph never went on one of these field trips.
WHAT?! What about all those times you almost got your butt burnt off because of some dude with magical forehead eyeball and him trying to blow you up. What about when you were helplessly floating in the serpents pass with said serpent trying to eat you and you thought Soka(who you apparently had a crush on) saved you when his girlfriend did?!
Yep. You went there. But seriously, I love the new series, but somehow I wish I could see more of the old characters through flashbacks or something. There are a couple, but not many. Sokka like dropped out of existence completely, lol.