Maybe we should split the players: Putin and Russia might be different arguments. Like, if Putin goes away, the "new Russia" could be seen as "clean" thus NS1/2 imports would be acceptable again. This scenario fails if the pipes fail though.
Considering all the Russian energy execs dying mysteriously and Putin being a KGB guy, Putin pulling something like this to make the him the only option and making “the only way out is through” for this invasion… doesn’t seem impossible.
Maybe he thinks things will be okay if his new annexations come to a relative peace and have grudging acceptance from Europe like they did with Crimea. I doubt it, but…