I like Cooper in a sense - he was a visionary for his time, and brought about a revolutionary change in the defensive shooting industry / society that was much needed.
With that said, I think he was, at least at times, too set in his ways for his own good. Example - he preached the Weaver stance til his dying day, despite its virtual eclipse by the Modern Isosceles stance, not to mention much of his - honestly - antiquated social commentary.
I think this comment, about iron sights to be exclusively used at the end of the world, is another good example of his somewhat obsolete ideas. If Marines, Soldiers and Airmen can rely on red dots, scopes and holosights through very intense tours in some of the world's most demanding environments time and again, then I believe optics of all sorts will very much be alive and well "when the balloon goes up."
With all that said, I do have a good set of BUIS on my rifle and practice with them regularly