It *could* be a good idea, but that's certainly not a "rating" in the sense of "indicative of performance".
You don't need a brain to follow the majority vote, yet a thousand perfectly disciplined morons (who are going to have an excellent such "rating") don't make a good vote chess team without at least one person to do the thinking (and even then, that's not really the point of vote chess).
According too you , thats why you want this rating system. So admins can decide if they want a 900 rated vc player on their team. Or if they are a rebel. Thats what you have said.