No, I was just taking "runaway self-improving" as a premise because that's what the comment I was responding to did. I fully expect that at some point "self-improving" would be cast aside at the altar of "self-replicating".

That is actually the biggest long-term threat I see from an alignment perspective; As we make AI more and more capable, more and more general and more and more efficient, it's going to get harder and harder to keep it from (self-)replicating. Especially since as it gets more and more useful, everyone will want to have more and more copies doing their bidding. Eventually, a little bit of carelessness is all it'll take.