The key contributor to Hollywood's waning influence is the generation gap; it's a cultural institution that is supposed to be culturally salient. Take the Mandalorian movie as an example; the biggest studio using the biggest IP to spend $300M on a movie... which lost $100M. That movie was competing at the box office at the same time with Obsession, which was made for $750k by a young Youtuber has made over half a billion worldwide.
As of today Ellison has an extraordinary amount of greenlight authority in an industry whose decision-makers are overwhelmingly a generation older. He can shake things up if he wants to, and I hope he does.