This is treading on sacred ground. I'd say Ghostbusters is my 2nd favorite movie of all time behind Back to the Future. Still, I'm all on board for another movie -- will it suck? Maybe? Will it live up to the perfection of the first movie? Probably not. Could it be a pleasant surprise? Of course it could.
If it sucks, we can pretend it doesn't exist (much like people do with Kingdom of the Crystal Skull). If it turns out to be good, we might see new life pumped into the franchise. I'd hope that it actually distances itself from the first movies, so we can focus on new characters. Venkman and Egon will never be in another Ghostbusters film. Let's move on and try something new and different.