Oh I agree that a self-updating intelligence can never be programmed to kill us all, form there I really don't know what may or not happen.. Maybe even one of those coronal mass injection that take place every 180 year circle or so could wipe them out, the last time a solar flare hit earth there were only telegraph posts..

Plus, who knows what can happen in the future, they could exterminate us all, most species go extinct anyways, or maybe not.. Too many variables for me to get to a conclusion, but I agree that the threat is possible.