Most ghosbuster fans wanted a reunion of the original movies actors(We lost Harold Ramis AKA Egon so its to late now) but instead we get this reboot that no one really wanted.
As a rule, any time anyone says "Most fans wanted X," what they really mean is "I wanted X." Nobody can really know what most fans want, especially in this day and age when people tend to self-select the content they read online based on how well it conforms to their tastes and beliefs. So no matter what side of the question you look at, someone is going to believe that their personal preference for it reflects the opinion of "most fans."
Also, remakes are not made for the existing fans alone. They're made to introduce the premise to a new audience. After all, fans come and go. Any existing fandom will undergo attrition due to changing tastes and priorities, aging, and eventually death. So no franchise has much of a future if it caters solely to the old fans. The priority is to invite new fans into the tent. Winning over the old fans is worthwhile too, but they're not the primary target.
And so what if no one wanted it? A lot of great creations are things that nobody knew they wanted until they saw them. Did anyone know they wanted the original Ghostbusters before it existed? How would anyone know they wanted something before they tried it? That's not how wanting generally works.