To carry on with the franchise you needed a sequel sometimes in the 90's
Or early 2000's otherwise a new movie would be a proper sequel. If you wanted a passing of the torch movie with trainees like Extreme Ghostbusters there had to have been 15 years between Ghostbusters 2 and Ghostbusters 3, but 15 years didn't pass between movies 30 years had, so you get Egon's grandkids stumbling across their old equipment.
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