First, actually he is in a position to make such claims. It is widely known that MD schools are going through a tremendous expansion yet the number of residency slots are not changing. So he was on point to say that in the future DOs are probably going to get squeezed. How much is anyone's guess. To ignore this fact is to be an ostrich with his head in the sand.
As to the assertion that people from low tier MD schools are not going to academic centers... thats wrong too. I agree they are not sent to big academic centers at the same rate as say, Harvard but for good students, the opportunities are still open. My class alone sent
4 to hopkins, 3 to Duke and then various numbers to MGH, Cleveland Clinic, Mayo, Wash U, Yale, and UCSF..