A "superdelegate primary"?

The Tenn. Governor publicly proposes the idea of a superdelegate primary. It's long been my contention that a superdelegate poll of some type will be taken informally, but I have a hunch this idea of a concrete, physical, two day meeting replete with conflicts, armtwisting, and records of who voted for whom will fall flat.

It's my guess that a superdelegate poll will be held at some point, but when we get to the convention, all of the superdelegates will vote as a block for the decided nominee. That image of unity going forward will be essential after all of this, and nobody will want a record of the dissenting votes floating around.

(However, I wouldn't be surprised if the Clinton camp tries to keep this idea alive as it would give them a late June date to stay in until.)