Personally I'd be interested to see what would happen if Sony/MS did what they could to make keyboard/mouse experience as good as possible on their consoles (I'm writing from a position of ignorance on the state of mouse/keys with current consoles) and encouraged developers to offer a choice in inputs, so that the locked-down machines can become the place for highest confidence in no/low cheaters. If other people want to pay through the nose to go beyond what consoles offer on the detail/resolution/framerate trifecta then I'm sure they could do so, but I really don't see how you lock down an open platform. That challenge has been going for decades.