I have this feeling that Ribbons ultimate plan is going to be to pull a Char in order to fulfill the 3rd part of Schenberg’s plan. I think he might have wanted to do it by bringing down the orbital elevator, but I have a feeling he has something else in mind too. By causing the Earth to be semi-uninhabitable he will force people to find a way to accelarate the movement to outer space. Further colony construction is already under way so I can forsee that being accelerated too. Somehow I think that is what his game about.
Crazy final scenario theory time. Ribbons ends up piloting a Mobile Suit with a twin tau drive system combined with whatever allows Masurao to go Trans-Am and ends up trying to saturate parts of the globe with the harmful red GN particles which will make those zones he visits the equivalent of Chernobyl, thus forcing people to find a safer place to live….IN SPACE!