Bro, do you even Ghostbusters?
• A connection between Carrie Coon's family and the 1984 movie that isn't just "they're relatives of [1984 cast member's character]!"
• A story that focuses on the new characters with the original characters as supporting
• A balance between honoring the spirit of the originals while primarily breaking new tonal, stylistic, and structural ground
• New ghosts, new threats
• No unwarranted references or tributes to the original films (as someone mentioned, for example, please no Rick just for the sake of having Rick, or Slimer just for the sake of having Slimer)
• Incorporation of Harold as elegantly as possible
• A closing status quo which opens up a world of possibilities beyond just more adventures with this specific cast
• Original cast stepping in to save the day
• Original cast taking over, even briefly, for the sake of letting them "ride off into the sunset" or something
Ironically, it's close to what you yourself started out saying in your last comment: I just want more time in this world with this premise. I'm ruling out the stuff I think serves no purpose beyond realizing fanfiction someone's been crafting in their head since 1989.
Sequels are always tricky, because they're inherently a semi-artificial construct -- get the characters back together, find a new obstacle for them to overcome (well, sometimes), and reassemble as much of the cast and crew years later. Some premises lend themselves to sequels better than others (for example, Rocky becoming the Mick to a younger boxer in Creed
), but in this case, making sure the (surviving) guys have some big part in this story that takes place almost 40 years later, states away from NYC, sounds like a stretch.
Since the idea came from a guy like Jason (as well as own comments at Fan Fest) tell us that this story grew organically out of a combination of the basic concept and world, with the new characters he was creating. I hope he hasn't conformed that idea around beats that would've made more sense in a movie that came out 20 years ago, just to please a section of the audience that is less important to the future of the franchise than newcomers.
If people want Ghostbusters
to survive and prosper, they're inevitably going to have to let it change, and differ from their expectations. Luke being on an island, Han and Leia being apart, that stuff serves the story. That should be the only goal.