That's the thing though, I don't know think it would be in a similar state. The biggest problem with the demo is it lacks polish and that will get added later. The gameplay is actually competent, the visuals could be improved but the big problem is with the characters and story they chose which I don't think will get altered at all.
This is my fear, the problem is that they have big guns at the helm, Nomura and Nomija, who's going to tell them "hey guys, according to our data people think Jack and his friend suck and the writing is shit", can you do some change?"
On the other hand they must be aware of the reception, Nomura himself said he watched people's reaction to the FFVII remake trailers, so I'm sure he knows, even JP is making fun of the characters.