Well my final answer is no 3 seasons is good enough unless 3 season ends with a cliffhanger.

Maybe season 4 will be a afterword, like what happened to them a few years after season 3.

Or they can travel to the other ends of the world.

Book One: Water, finding a waterbending teacher
Book Two: Earth, finding an earthbending teacher
Book Three: Fire, finding a firebending teacher, defeating the firenation
Book Four: Air, finding others who can be taught airbending, rebuilding the air tribe (amidst threats of firenation hold-outs, of course)

Without Book Four, the avatar cycle will just end when it gets back to the air tribe and there will be no peace.

Makes perfect sense to me.?? Four books, but only four books.?? Any more would ruin it.

Perhaps book four will discover that someone Aang is supposed to be paired with can learn airbending.?? Katara or Toph, take your pick.?? The air nomads have to be rebuilt somehow.

Good theory, but how can you rebuild people, since Aang is the only known Airbender left (I don't believe that he's the last) he'd have to restart the population. I think an entire Book about rebuilding the Air Nomads would be rather boring.

This was what I was thinking actually. 4 elements, 4 seasons, 4 books, right? A 4th wouldn't be so bad. But I also agree with the others who say it should stop after a fourth. It may be a short series compared to others, but it will be great I think!

ehh... I think the title would still be silly still.

Avatar: The Last Airbender

pretty straight forward, he's the last airbender.?? If there is another airbender, he was never the last airbender.

of course, the spanish title is just Avatar: The Legend of Aang... they could get away with it there.

I wouldn't like a solution that made there be another airbender, even if they were like frozen or something, because it would just kinda ruin the whole 'last airbender' thing for me.?? if he's the last known airbender, then he's the last known airbender... the title should run from an omniscient narrator point of view describing exactly what the facts of the story are from the perspective of the one making up, thus knowing everything about, the story.

ey should def have a fourth

end it at book 3 then make a movie.... a real movie, not one of those two episode specials

Gantros' theroy comes into play here...but in that light(or darkness) i?? think there's a bigger threat somewhere...i mean c'mon is the Fire Lord really that powerful? we've been lead all along that the ONLY way that Aang could beat ONE person was to learn??ALL the elements? i don't think so...i think the Avatar's real purpose??of maintaining balance??has to do with a threat to??that occurs every once in a (insert some arbitary time)...perhaps that threat is what Kyoshi was lobbing those hill sized statures at...or the guy in the ocean created an entire tidal wave to attack...you guys catch what i'm saying here? unless of course those scenes during Avatar State was just examples of how powerful the Avatar is...

I'm all for more seasons if they come up with a new story arc.?? I like the "Dark Avatar Theory" idea that's floating around on the boards.?? Cool stuff.?? I say after the three season arc, restart the series (everything takes place some years later) under a new title like "Aang: The Last Avatar" or something.?? Throw in some new threat like something from the Spirit World.?? And Aang dies while in the avatar state defeating this terrible threat (hence the title of the series).?? It could work.

As long as the show if making money for the network, and depending on the contract legalizational mumbo-jumbo, Nickelodeon could easily make more epsidoes without the creators.?? It might not be as good, but it could happen.?? Disney did with Gargoyles didn't they?

The dark Avatar theory could work that would be awsome and probably be the best way to end the series but I think defeating the Fire lord is the bestest way to end it afterall it is the main porpous of the show.

this is a great theory and could be completly plausable and a great way to end the series. They could be set as flash backs as Ang and the others help rebuild the four nations in their time