It's hard to really give a yes or no answer to such a question, what I would say is I'd be interested in a more in-depth study as to
why these kinds of films are so culturally popular at this time. Every time periods popular film genres are usually in reaction to what's happening in society around that time, you can't just ascribe it to big companies pushing consoomers even if they are part of the audience, because the larger group is the casual viewer. It begs the question about
what about these big spectacle films, along with just the best performing films that don't fall into that category, speak to people and make them go to see them. Something like that is also somewhat hard to do without the ability to look back on the bigger picture like you could do with looking at why certain films were popular in any earlier decade.
I don't think I'd be that pessimistic over the whole thing, especially in the whole "replacing mythology" aspect. Many of the popular films today still use tropes found in ancient mythology when it comes to character arcs or story tropes.
Another thing you have to remember is that mythology, especially Greek mythology, has a lot of it that just didn't make it to today. Some of the big popular ones managed to make it or just got lucky in managing to survive, but there's likely a far greater percentage of what was popular/available back then that
didn't make it. It didn't help that a lot around that time was still mainly verbal tales told at festivals or other social gatherings. There was likely a lot of crap that was popular then too. It's hard to tell right at this minute which films will go on to be remembered or forgotten decades from now. We at least have the advantage now of not losing something entirely like what has sadly happened to many older popular films (
stats showing half of all pre-1950s and over 90% of those made before 1929 are gone forever), ones we know were massively popular back in the day, but have become all but forgotten today due to no sources existing for them.