Think about the line. "We'll be out in a year......and then we'll be back".
"And then we'll be back"???? That makes no sense for the characters of Seinfeld. They'll be back *where*?? Back in Latham? Back in New York? It just isn't a line that fits with the story or the characters. So, "They" means the actors. The *actors* will be back.
My theory is that the four of them discussed the possibility of returning for a true "final" season. Think of the money for them? The ratings? They put that line in as hint. Just like Kramer saying in the beginning, "Do you smell that? There's something in the air." There was 'bullshit' in the air. The 'bullshit' being this *fake* series finale. It's not really the finale.
One year off, and then Larry David returns as a writer. They have they're best season ever ending with them finally getting the "Jerry" show going. It will close with them doing the actual first scene from the pilot, with the "buttons" conversation. Elaine and Kramer will be there watching the filming of it and it will pull away and fade to black.
It'll be PERFECT.
- Dallas P.
BTW... I LOVED the finale. Brilliant, IMVHO.