It's mostly because Hollywood is creatively bankrupt and eking out diminishing returns from strip-mining the Star Wars or Marvel universes. The odd thing is, q

It's mostly because Hollywood is creatively bankrupt and eking out diminishing returns from strip-mining the Star Wars or Marvel universes. The odd thing is, quality video production has become much more affordable with the end of film and rise of mirrorless video cameras and NLE consoles running on commodity PCs. SFX has gone up in price but is not required for every movie, so you would expect an explosion of creativity, not the industry hunkering down around a limited number of franchises and sequels.