Bringing everyone on board is a talk radio talent few have. I can't do it at that high medical level. It's doubtful many can do it,bring everyone on board.
The level to reach is first year of college. Go beyond that and lose audience, go below that and lose audience. Rush had it down few others do.
The only replacement I see is Mark Steyn. He would be great.
But perhaps there's some Baby Rush that we don't know about, waiting in the wings.