Forgive me if this has been discussed already, been back a few pages and didn't see any topics about it...
So anyway, the fire nation will soon learn about the planned invasion from Azula, no doubt. But with the fall of the earth kingdom, perhaps the fire nation will let down its guard slightly, as they will soon have the earth military under their control. Game over, so where does the gAang turn to next? The water benders, of course, the last nation still completely in the game to fight back!
The moon will eclipse the sun, or in the avatar world, water will be eclisping fire. The fire benders will be at their weakest at the same time that the water benders will be at their most powerful. Brilliant, if you ask me..... Ideas/comments?