LOL

People can barely tolerate dungeons taking more than 17 minutes, let alone a full-on run against mobs scaled to your actual gear. But on a serious note though, if anyone is BiS on any patch level, then the chances are the dungeon won't really sate their hunger. Dungeons aren't really something to get excited about.

I'd personally be a fan of them taking the final fight from a given raid tier, upscaling it to current BiS, and allowing people to challenge the savage encounter in its full might. Basically the Faux Hollows of savage encounters.