WHY!? It was the only time I could enjoy playing this game without seeing every other server's trolls!
While I do think CRZ is a good idea in general, there are just too many problems, and issues with it, that Blizzard has never properly addressed. As such they shouldn't be expanding it into the DMF zone, or any MoP zone for that matter; until they get a handle on those issues/problems.
My main issue with CRZ, is having to deal with the jerks from other realms. Sure every realm has it's share of jerks that like to block quest givers, and thing like mail boxes, or in the case of the DMF the shooting gallery. But there are realm wide social consequences to being a jerk. Jerks don't last very long in good guilds, that care about there rep on their server. With CRZ jerks are now free to be jerks with no social consequences whatsoever.