[the entire industry is run by one particular, clannish and highly nepotistic ethno-religious minority]
Not sure where you’re getting the bit about nepotism or even clannishness. I can’t think of many Jewish families that have extended their dominance beyond a generation or two in the movie business. Kirk Douglas and Michael Douglas were pretty successful. But Michael Douglas is the end of the line, and he’s pushing 80. So which of Spielberg’s children is an Oscar-winning director and commercial success? Fact is they’re all doing typical humdrum middle class things many steps down from their well-known father. Ashkenazi Jews (i.e. most of the big names in any field) dominate the business for the same reason they dominate so many other things - a 10-point IQ advantage.
https://en.wikipedia.org/wiki/Ashkenazi_Jewish_intelligence