It was obvious last summer when Trump announced that Rush decided to ride the Trump train. He figured, like everybody else, that Trump would flame out in short order.
When he didn't, Rush had a dilemma: announce that Trump was no conservative and he would have nothing to do with him and risk alienating Trump's growing following, or embrace Trump, keep the listeners, but risk being labeled a sellout.
He chose the latter. I suspect, if listener numbers could be tabulated, his audience is smaller than last summer. I gave up on him then, forever. Rush has no principles, except to make money, so all the bullshit he spouts about conservatism mean no more to him than the "suggestions" Trump makes mean to him.
Rush is old news.