If this manga was full of cliches I would like a happy ending. But it's something special in the past, I want a same old ending of history repeating itself, with unknown exact ending to the shinobi world, but I'm sure that won't happen, so your post stands true.
I agree this would be the best ending. An ending where you wonder that will happen next and you can only imagine. The story is over, but the world and the characters go on. Giving us an "everyone unites as friends and dance in a circle" ending ruins that.