That's not a reboot, that's a sequel.
Reboots are remakes intended to restart an entire series of films from square one. That's all they are. Usually they're not even that, they're just the empty term used in place of remake because that's how terminology works now.
But I don't think fictional people no longer acknowledging the fictional existence of Stantz/Spengler/Venkman/Zeddmore is a sticking point.
What's way more important is that this version of the movie is funny and interesting, with really well-developed characters playing off each other in endearing ways.
That is the most important thing and right now, after two trailers, that is pretty goddamned up-in-the-air, and I'm not supremely confident in whatever might be coming down.
I really do think Feig's decision to, just before filming, swap McCarthy and Jones' roles isn't a great sign.