This just reflects changes in the humanities themselves. There is nothing called "humanity" any more in the "humanities." The very word is archaic--not to mention the concept. Contemporary study in the "humanities" holds that there is nothing called the "human." The human is a kind of religious vestige, a universalist fantasy that is itself ideological and foisted on groups and inculcated in individuals, often to their disadvantage.The humanities now study the ways human animals are essentially different and divided from each other into various kinds of groups with power distributed asymmetrically among the groups. The arts and histories and even the sciences these groups produce either reproduce and strengthen these asymmetries or expose and oppose them.  And there is no "truth" or "philosophy." There is only the sociology of knowledge. So the decline in the humanities is not a decline in enrollments to be addressed with better marketing. It is an outcome of the humanities themslves.