I like Sinster's idea of having Ghostbusters a world renowned organziation with training schools across the globe. Very good! If not though, another idea is for Oscar to be a full-fledged Ghostbuster now, that'd be really interesting. But whether there's a new main cast or not, the originals (Venkman, Stantz, Spengler, Zeddemore, Tully, Barrett, the Mayor, and maybe even Peck… perhaps) should definetly be in it at one point.