The break-up of the Union might well be stopped though Chilco, as Sturgeon won't get indyref2 anytime soon because she won't have the leverage of a Confidence and Supply deal. She'll argue about Brexit being a material change but BJ can just say no, pretty much. That's the only glimmer of hope that I can see.
She’ll hold the referendum anyway, with or without Westminster’s consent. If she wins it, there’s no possible moral argument that Boris can put up.