As in ... lack of interest, mostly on Rush's part.
He's always said he will continue only as long as he enjoys it, and I think his enjoyment is diminishing. He seems forced, his guest hosts aren't very engaging, and he's obviously not interested in taking a leadership role against vote fraud.
His internal monitoring probably already shows a shrinking viewership, so he'll likely retire before too long.
er, make that shrinking “listenership” not “viewership”
Makes sense to me. Thanks for explaining. :^)