I agree with you in principal but disagree with you in regards to The Rolling Stones. I'm not a huge fan myself, but their fanbase spans all ages. A lot of college students that are still into rock/alternative are fans, and I know current college age fans that have attended their shows. I don't think they pretend to be pop-relevant, they know their current place in the world of music. They were probably more irrelevant in the mid 1980's than they are now.
Their most recent tour, which is still ongoing (and delayed at times due to COVID), has grossed almost a half-billion dollars. I don't see them stopping even with Watts passing away - he already had to bow out from the current tour for his medical issues and they continued with a different drummer. There may be a compromise where they may still tour on occasion but there may not be any more new recordings now that he has passed. RIP...