Very interesting question. I think it's possible for recent mythologies to become as legitimate as ancient ones. They all have to start sometime, right? I don't know how exactly that process will look in the modern world, though. I feel like so many stories are based on the archetypes of ancient myth, from books to films and movies. That is the key to embedding them in our collective unconscious. But which versions will last? Hard to say. I read once that the only thing every society on earth has always had in common is storytelling. It's importance to us as a species is huge. Personally, I hope Middle Earth lasts forever!