While I would've loved one final moment between Mako, Bolin and Korra as The Fire Ferrets "wow, look how far we've come" and "well, I think this is what I'll do", looking back at both ATLA and the rest of LoK, I think they did have several ways to reminisce and tie a lot of their stories up throughout the other Books.
For all the crap it got (and deserves) the clip show Remembrances did a good job of making us...uhm, remember the Fire Ferret's journey.
Thinking back to ATLA, we never really got a sense of what would happen to Team Avatar after the war, only that they "lived happily ever after", and if it weren't for the Legend of Korra, we would've never had guesses they founded an entire new country.
With LoK' characters, despite the finale not being 100% rewarding, I feel like I we know more about what will happen to Mako, Bolin, Asami and Korra, and even the rest of the world.
But, yeah, I would've loved even have an amateur pro-bending fight on Air Temple Island, with Kai and Meelo brainstorming ways to get airbending into it now that there are more in airbenders in the world.
Little things like that. I have no problem with Korrasami whatsoever, but one can't but resent it a bit if it meant placing other moments away.
I REALLY hope we get a movie, comics, something.