No Ghosts Left for Ghostbusters 3?

I saw this story last week but browsed it too fast to catch anything new.  Ghostbusters News and their fans were on top of it... the Chicago Sun-Times got a new quote from Aykroyd that pits the opening of Ghostbusters 3 as one where no ghosts remain due to years of hard Ghostbusting work. 

No ghosts are left because we took care of them and stored them all. We took all the ghosts out of the hotels and the streets. But then an event happens and something comes through from the next dimension.

That would put the Ghostbusters in a defunct status without making them failures ala Ghostbusters 2, and perhaps freezing too many improvements on their technology, keeping the classic designs.  I like it.