Fans want a movie with the original crew busting ghosts one last time. That isn't what they're going to get. Sony wants a movie that can launch a whole new franchise of Ghostbusters films, merchandise, etc.
I've been largely indifferent to all developments on this movie and you perfectly summed up why.
Normally Sony would just do a reboot. But they don't fully control the rights. So they need the old guys. But the result is nothing is happening because they have no real passion for it.