Is there a serious non-fiction treatment of the question?
Fortunately, Watts shows his homework and provides an entire appendix explaining the science he is drawing on (as one would expect from a scientist): http://www.rifters.com/real/Blindsight.htm#Notes
I've read through a number of his references and a few things on his blog like PRISMs, although his main source, philosopher Thomas Metzinger's Being No One, kicked my ass. You want 'serious non-fiction'? Go to.
In Blindsight, a close relative of Homo sapiens sapiens is described as not consciously sentient but able to intelligently interact socially with humans. This seems unlikely.
The not-conscious ET aliens were much more believable, since they were not a close relative. You got the feeling that their interactions with humans had a Chinese room feel to them.
I was browsing my RSS feed, as one does, and came across a New York Times article, "A Village With the Numbers, Not the Image, of the Poorest Place", about the Satmar Hasidic Jews of Kiryas Joel (NY).
Their interest lies in their extraordinarily high birthrate & population growth, and their poverty - which are connected. From the article:
From Wikipedia:
Robin Hanson has argued that uploaded/emulated minds will establish a new Malthusian/Darwinian equilibrium in "IF UPLOADS COME FIRST: The crack of a future dawn" - an equilibrium in comparison to which our own economy will look like a delusive dreamtime of impossibly unfit and libertine behavior. The demographic transition will not last forever. But despite our own distaste for countless lives living at near-subsistence rather than our own extreme per-capita wealth (see the Repugnant Conclusion), those many lives will be happy ones (even amidst disaster).
So. Are the inhabitants of Kiryas Joel unhappy?