I think change would be the best thing for Ghostbusters III. That was the problem with Ghostbusters II, (or at least it's the reason why people complained, I love it) it was so similar it was insane. A new cast would be just what is needed, and Aykroyd said that the original cast would not be left out, and even though they're not the main characters, their screen time would be very important. I hope it happens. Oh, and for my cast members, Chris Rock as the lead, Jimmy Fallon, and either Jack Black or Michael Rapaport.