I'm not saying the market isn't a sucker for new stuff, porn or otherwise. What I am saying is that we (the audience) can happily tolerate a dry spell of new stuff for quite some time without feeling we're out of good things to watch.

Though I must admit that the idea of a porn writer's strike made me feel quite amused!

Novelty is important to broadcast TV and big marketing. If you're going to spend a lot of money on marketing, and put a show in a scarce broadcast time slot, it's important that you're marketing to everybody, because nobody has seen it. You don't want to market a re-run, because so much of your marketing money is wasted on people who have already seen it, or already decided they don't plan to see it. But the long-tail distribution methods work differently.