Keeping the show going? Online, that is. Perhaps someone, with enough time on their hands, could create a web site that will give Seinfeld life online. Many people, especially loyal viewers, are capable of writing scripts; why not guess/invent some plots that would happen to the "New York Four" in prison?
Most of us have the characters so embedded in our subconcious that we could practically hear the words spoken as we read them. Prison life for the Seinfeld gang has unlimited plot possiblities; I can just imagine what it would be like for the show to continue after the finale.
I'm not a writer, nor do I have much spare time, so I can't really get the ball rolling. I hope someone can.
Just a thought...