Let's clear up some misconceptions or whatever about GB3 (and GB in general).
I see no GB3 in the near future. 10 years down the road, who knows, but I see none in the near future.
Second of all, I would like to address that one doesn't have to hope GB3 still has hope just to be a true Ghostbusters fan. There really isn't any true definition of a fan; if you want, attach a number or two to it and we'll get back to you. (Ex: Is a true fan based on the amount of FanFics he's/she's written? Or how much he/she loves GB? You don't have the power to define that. No one does).
Also, I wouldn;t say Dan Aykroyd is in a slump. Just because you don't enjoy the stuff he does now, doesn't mean that he's in a slump.
Also, and this is a controversial one: Do we really want another GB movie? Even I can't answer this. Well, I mean, yes, it would be nice to see some proton packs on the big screen again, but would GB3 feel like the originals? (Did XGB feel like RGB? Not entirely).
Ex: Again, I turn to Star Wars. I loved TPM for it's lightsaber action and a few other elements, but the movie didn;t feel like the original trilogy.
I would like to see GB3, but how I would like to see it? That's the real question.
And the future of GB3? Not in the next few years. I can almost guarantee it.