Still has a massive audience, recently had a best selling booking, and generates headlines -- but I guess you have a unique definition of relevance. I'd encourage you to listen to his guest interviews -- they are amazing.

I was previously a Stern fan and I distinctly recall listening to him on my way to school on 9/11 as he was covering the planes hitting the twin towers. I haven't heard or seen a single thing from Stern since he switched to satellite. I have no idea how to even listen to his guest interviews if I wanted. I could search for it, but that's kind of the point, I would have to search. It's never popped up in my YT/Twitter/FB feed. Friction is powerful, especially at scale.

I used to listen to Stern every once and a while when he was on the radio. I haven't listened to Stern since his move to Sirius radio. I'm not saying it was a bad move for Stern, but he certainly lost some amount of relevance, just didn't become irrelevant.