They'll put off a sequel for a few years, pretending its a work in progress.
Then, rather than reboot per se, they'll announce that they're going to do one set on the original GB universe, with Ray as the CEO (supervising a new crew), Egon dead and Venkman retired.
They'll spin it as "this franchise is so great we can do stories in both the original universe and the wonderful reimagining that Paul Feig gave us that we really, really, plan to revisit someday, just as soon as all the players can clear their schedules and we have the right script."
Meanwhile, McCarthy, Wiig and McKinnon will have moved on, and Jones will still be (along with Keenan) the SNL token, because nobody dares fire her even though no one finds her that funny.
