It sounds like one of those things that sounds good, and everyone asks for, but any version of it will be a disappointment (like diadem 1.0). If it is it's own zone, can you name any reason for people to want to go there? Being able to kill each other won't be good enough in the long run, and placing non-pvp related content in there seems unfair to just try and get pve players into it for slaughter. Frontlines has point objectives with crystals and killing each other. The others fill people's competitive streak. Admittedly I haven't read the whole thread, so maybe someone mentioned a legit and interesting idea.

Summary: I am interested in the theoretical concept proposed. I don't see anything that makes me think it can become relevant content.