There are certain universal and timeless truths about what works in a classroom that no technological advancement (even a humanoid robot) will ever change. And this knowledge is where being the old man on campus can have power and resonance. 
Our schools are failing not because of what happens in the classroom, but because of what happens—or more to the point, what doesn’t happen—at the dinner table. If we wish to be a serious people, then we must bolster our institutions with the power to humanize and domesticate the bedlam within us all.
Encouraging people to be gracious, and to recognize what others have provided them through no merit of their own, is not about “guilt tripping” them. It is to encourage a particular way of existing in the world. Gratitude acknowledges the plenitude of goodness that surrounds us every moment of every day in millions of small acts of people we do not know.