Nostalgia is a word used so broadly that it hardly means anything anymore. But we’re going to see more and more representation of older media as the profit incentive makes it increasingly difficult to get a non-sequel, non-IP film made.
And, as already noted, monoculture is long dead. I think you could argue that theme parks are one of the last widely shared cultural experiences left in the United States. And even that is under threat as regional theme parks go under and destination parks position themselves as luxury products.