Khrushchev though? I mean I'm not saying it happens soon, but the more people close to Putin are getting in trouble the likelier it will become that something will happen I think. In fact I'd be very surprised if not at least a few people are working on exit strategies right now. (personal ones if nothing else.) Lets not forget that he's been scapegoating the FSB, he's been purging the army and scapegoating the leadership and now the navy, those are his pillars of power.