To a point, yes. Spielberg and Lucas were accused by Peter Bodanovich of "juvenlising" films because the runaway success of films like Jaws and Star Wars. But it wasn't Spielberg and Lucas's fault that Hollywood cashed in with second-rate imitators, or that the summer blockbuster became a template that followed for many years afterwards.

However, even in those days (the late 1970s/early 1980s/early 1990s), mainstream Hollywood was still a lot more creative than it is today. At present, mainstream Hollywood is more timid than at any point in its history. There outliers and exceptions (Nolan, Villeneuve, Peele, for instance) but on the whole Scorsese is right. However, the tide may be turning. Perhaps we will see an end to the slavish reliance on legacy sequels, prequels, reboots, spin-offs, cinematic universes, and see more original stories getting told again. One lives in hope.