I don't think the issue has ever been wether people want it but rather if SE can implement it. Its been an idea thrown around a lot before now.

Regardless SE says their are technical issues with how their servers are structured that makes such a system difficult. Lacking any real first hand knowledge I cant judge how serious an issue it is but I've heard friends in IT rant about frustrating server architecture and difficult system changes for it to sound like a valid issue to me.