He should totally patent his boarding method. Who cares that it could save the airlines billions? He could rake in so much dough by licensing the method or suing airlines who use his method without a license! And if the patent is vague enough, he could probably collect on all the other inferior boarding methods too!
In all seriousness, the boarding problem only got worse once airlines started charging for bags as people starting carrying on more and more. I read somewhere that Southwest actually saves more money by offering free checked bags and saving on boarding time than they would make had they charged for free bags.