Someone with a hardcore 'rationalist' position (someone who thought all moral statements could be derived from first principles e.g. a Kantian) would probably reject it, but they're basically extinct in the wild.
In what sense is this a 'rationalist' position?
Stuart has worked on further developing the orthogonality thesis, which gave rise to a paper, a non-final version of which you can see here: http://lesswrong.com/lw/cej/general_purpose_intelligence_arguing_the/
This post won't make sense if you haven't been through that.
Today we spent some time going over it and he accepted my suggestion of a minor amendment. Which best fits here.
Besides all the other awkward things that a moral convergentist would have to argue for, namely: