Yeah, I also think that the only way the Unplugged feature works is with some regularity. I'm afraid that they might wait too long until it doesn't make sense anymore for them to pick up where they left off, like every other Unplugged.
Honestly, I've always kind of gotten the feeling that they're more doing the Unplugged because of the massive demand for them and not because of any real desire on the part of the crew.
I never really felt the sense of ownership of the feature in the same way as Metal Gear Scanlon or Breaking Brad, for instance.