Ascension sent the series backwards. With games like bloodborne and ds3 out taking full power of the next gen consoles, anything short of that would be a disappointment.
Series needs to be open world and massive for me to even consider it. Even though, I enjoyed the hell out of the first three plus the PSP additions
Open world GOW would be a huge mistake imo, it benefits from being straightforward and having that crazy camerawork. Being open world would make it a very average game.