This scientist is misleading.
In biology there is the genetic condition of 'inbreeding depression'. This means don't marry your sister or first cousin. Now when you have countries as large as most modern day countries you aren't going to get inbreeding depression unless you actually go looking for it. For a scientist to infer that people of the same race having kids is what causes inbreeding depression is wrong 99.9999999999999999999% of the time.
http://en.wikipedia.org/wiki/Inbreeding_depression
The Term Hybrid Vigor is when one individual crosses into a vastly different population and the genetic health of the population improves in the long run (If and only if that trait is positively selected for which many positive traits in our society today are not being selected for). This would be a trait such as lactose tolerance in a society that relies strongly upon cow milk. For 99.99999% of couples this is not the case, especially in today's society where we're more accommodating of genetic differences in biological areas (soy milk, water, fruit juice for example).
http://en.wikipedia.org/wiki/Hybrid_vigour
It isn't pleasant to talk about but trends across the board are heading for less genetic fitness, in all social classes and all races. I'm sorry but you cannot convince me that sending millions of individuals from a country that has an IQ average of 75 into a country that has an IQ average of 100 is going to be beneficial in the long run for the higher ranked country and native people.
http://en.wikipedia.org/wiki/Outbreeding_depression
http://www.aei.org/video/101414
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