I know it's a long shot, but was chatting with Netflix....
About bringing back Carnivale, and the person I spoke with was not only VERY receptive to this, but made it sound like there was already a campaign within Netflix to do so! I know HBO hasn't been very flexible in the past, but if anyone can do it, NF can. They have already saved two shows that I know of in the last year or so, and Carnivale has fans who work at Netflix and are being vocal about it.
This JUST happened two minutes ago, and I came straight here, rarely post here, and VERY rarely start a thread. But this one I had to share. I do have a copy of the chat in my email. Also, I would encourage all fans to make this suggestion to NF. I am surely not the first, and by the response I received I believe the more the better. I think this is a better strategy than petitioning HBO. If NF gets enough response, maybe they'll offer HBO more money, and that is the only thing that can make this happen... money.