Dude, that's not how this shit works.
During those times of the 'great movies' you speak off, there were many movies like the "Marvel" ones today.
Like Star Wars, Western Movies, Classic Action movies.
and guess what? they made more money and made more press, it's that simple, because people like that.
and guess what? there are still 'great movies' / 'artsy movies' being made today
We had Lighthouse, Green Knight, Hereditary / Midsommar and other crazy shit, in fact there's more movies like that coming out today because there are more ways to do it on streaming and stuff
Scorsese is just mad that he doesn't make as much money as Marvel Movies