As for Ghostbusters, Bill Murray moved beyond the franchise after the original sequel, and due to his deal with the studio, he prevented further movies from being made without his consent.
“I was in that movie just because they asked me, and I knew if I said no, I was saying I didn’t support that movie.
Bill Murrays says he is ready to return for Ghostbusters 3 after decades of shying away from the franchise.
As for why he would return for Ghostbusters 3 at this point in time, it all has to do with the people Bill Murray would be returning to work with.