It’s the “Karate Kid” syndrome, they always have to try to replace the male protagonist with a girl to extend the franchise and basically tell the very same story.
With respect to Marvel (for example Thor), the OP (the Ghostbusters idiocy), and a lot of other franchises, you are correct.
With respect to Star Wars, they are actually drawing off of long term “cannon” stories that go back quite a while. As in back to the 70’s and 80’s.
I do not think that is about being PC. It is about trying to condense a ton of cannon into a movie or movies.
JMHO, of course.
PS I do have to say that Marvel scored with Scarlet Johanson as Black Widow. Dang but she spent a lot of time learning marshal arts and it shows. She actually may be able to kick six guy’s ####s!