Star Wars is overrated anyway, the main reason it took off in a huge way was because Lucas fluked out into the "lets make Darth Vader Luke's father" which wasn't even in the original Empire drafts that made that original series more interesting than it had any business being. Otherwise it would've just been Star Wars 2, Star Wars 3, etc. generic sequels to the first film. Lucas is a mediocre writer in many other respects, the prequels already proved he had no clue what he was doing. Disney is just trying to milk nostalgia from the OT but took too much risk with the character of Luke in VIII.
And Star Wars didn't have to compete against anything in the 70s/80s ... there was no LOTR trilogy, no Marvel films, no Avatar, no Matrix, no Spider-Man, no nothing, it was the only big fantasy IP at a time where like there were maybe 2-3 "big budget" blockbuster movies a year, now there's that many in a month. It was the only game in town.
The sequel trilogy was never going to be anything that mind blowing ... the story arc concluded in Return of the Jedi, they were never gonna top that.
Star Wars is not king, Cameron with all due respect is the king. Avatar and Titanic both beat every Star Wars film inflation adjusted, sorry Star Wars nerds. Marvel also has a better overall canon of characters .... far better, they have 60+ years of thousands of writers and hundreds of issues of depth to even "side characters" ... Star Wars characters like even Han Solo or Boba Fett (lol, gimme a break) are BORING compared to what you can do with Iron Man, Deadpool, Dr. Strange, Thor, etc. All those characters have fully formed story arcs, personalities, etc.