oh gosh I think this escalated sometime between page 1 and 10 LOL
ahem so my opinion on the original topic is something like "that might be cool but I don't really have a big craving for it". Not only is couch co-op for an RPG hard, but I feel like the type of game you're mentioning is in such a niche that it's not in very high demand--you can kind of get bits and pieces of the experience by playing other games.
So it would be nice, but I don't think it's really uh, high-priority right now, or something. XP