I'm not really sure why people are talking about this. First, really? In 2014 we're having a discussion about whether children should be adopted by parents who look like them? And second, the example being cited -- the new Cheerios commercial -- appears to feature a biracial child and her birth parents, not her adoptive parents.
It's good to know I'm not the only one who occasionally has trouble coming up with compelling topics about which to write.