I wonder if this trend of "Kidults" (as in adults buying toys or having other very "child-like" hobbies and preferences) is fueled by how little pathways to joy we leave to adults so many revert back to when Ninja Turtles made them happy.
@tante In that regard, it's also interesting how there always were hobbies that were almost as strange, but for some reason accepted by society: Sports fandoms, model railways, carnival, …