when you think about it long and hard enough, GB isnt really that funny. (no offence, its just an opinion.)
come on, good ol Mel Brooks might pull it off! come on! he did it to westerns (Blazing Saddles) Sci-Fi films (Spaceballs) Universal classics (Young Frankenstein) and History films (Hiistory of the World part 1). without doubt, the man might be able to do it with Ghostbusters/general paranormal.
its a good idea. it might start a chain reaction for GB3 (just an idea, but dont knock it)