The first time I saw this paper/chapter presented at a workshop last year it left me with more questions than answers. I have since been convinced. The paper makes intuitive sense. That said, I am still a little uneasy with some of the implications of the argument. For one, providing education with a foreign labor market in mind may distract us from trying to find solutions to local problems. If we follow this route we may end up with a lot of government trained cosmetic surgeons ready to move to London or Paris but very few specialists in tropical diseases.
The minor objection cited above aside, I am all for exposure through immigration (and eventual return, of course). This might just be what it will take to undo the isolationist effects of the Sahara (from the Eurasian land mass) from centuries past.