Until about Mondale, VPs were seldom given much to do. Yes, Nixon made a handy bad cop to Eisenhower's good cop. But without going to a reference, I can't name an VP who didn't succeed to the presidency between George Clinton and Alben Barkely. Well, OK, John Calhoun, chiefly because he was on such bad terms with Jackson.
Be careful what you wish for. It must be said, the outcome may be unexpected.
Also, Vance's role is not to be the successor to the king. He's there like all VP to be blamed when the time is right.