It also seems that if you take a utilitarian point of view, so none of this preserving stuff because it's unique or interesting only if it's useful, then once you have strong AI and decent robotics is there any use for humans or are they just technically obsolete?

And if the answer is that we're not really useful enough to justify the cost of our continued existence then should we try and define friendly to include preserving us or should we just swallow that metaphorical bullet and be happy that our creations will carry our legacy forward?