With a $45.5 million haul at the box office this weekend, “Ghostbusters: Frozen Empire” is the number one film in the country, and the Ghostbusters are back. While it remains to be seen if there will be a sequel—‘Frozen Empire’ cost $100 million, so it’ll need to make much more than “Ghostbusters: Afterlife”— fans will still have plenty of modern material to keep them happy if audiences want them.