Pop culture is not dying, it’s just becoming ever more fragmented. Personally, I think its mostly a good thing, although there are benefits in having shared experiences.

When I was a child, tv was the main source for daily news and entertainment. News were okay but 95% of the programmes on the telly were just crap. Sure, people were watching that crap, but it was still crap to me and many others. The ability to stream whatever whenever at least allows for filtering and picking.

It does not limit discussion. For example Better Call Saul had very interesting discussions based on each weeks episodes. And they could be discussed face to face with friends too.