Once it becomes measurable, then you can implant emotions into AI agents. Once you an AI identity that is emotionally indistinguishable from us non-AI identities and which is infinitely smarter than us, what purpose would we have left to fulfil?
OTOH what happens if there is a whole species of beings who are smarter, stronger, … than our species? Would our collective purpose become to accept them as our betterment? Our personal purpose would vary greatly from fear to wonderment.