I don't think I would mind too terribly much paying to watch TV shows on DVD. I think about the $90 a month we spend paying the cable bill and also about how we watch maybe 2 shows regularly. I know a few people who pay upwards of $200 a month on TV and don't watch all that many shows, either.
I think these networks could distribute pilots on DVD to anyone who wants one, and then they decide from that whether they want to commit to a subscription for the show. Or with the increasing popularity of broadband services, one could download the pilot and then subscribe if they wish.