TBH, the actual good thing about the original movies were the characters. If they are going to be entirely new characters for the next movie, then who the f**k cares? It could be some really big turd like the Alien vs Predator movies, basically cannibalizing the 'mythology' set by their predecesors and just trying to milk the franchise.
I don't think the title will be "Ghostbusters 3", then, probably it's just going to be titled "Ghostbusters", the title would be "Las Cazafantasmas" in my country, then xD