Another problem I see (whether it's a reboot or sequel) is that those glowing ectoplamic ghosts of the 80s just aren't remotely scary or frightening anymore.
What really needs to happen (and I know it won't), is for the Ghostbusters to go up against the freaky, Ring-style ghosts and creepy, wall-crawling creatures of today's
horror movies. That would be fun as hell to watch, and much more in the spirit of the original movie than what they're probably planning to make.
If we're not as freaked out by the ghosts are the Ghostbusters are, then the movie's just not going to work.