He's had a long, very long, and successful run. And even with declining ratings, I think he's still #1.
I found him exciting and interesting for years, roughly 1990 to 2000 or so. Now I listen rarely, and don't find him all that interesting or entertaining. That could well be me, or just plain "bored with familiarity." But there is a crop of new people every day.
I'm really glad he is and was successful. I believe his efforts have brightened and energized many a conservative. I wish him well, and hope he gets to "wind down" in a way that suits his desires perfectly.
Yes, he’s vexed any number of liberals and lived in their heads rent free, so to speak as you hear him tell it. But the edge is gone and it is time for the next fresh generation to take up the battle standard. Frankly, he’s not up to it anymore.