I'm not sure what would change demographically, but I could almost guarantee that every single presidential election would be a 2000-like debacle under a NPV system.
I hear this argument a lot from EC advocates, but it's worth remembering that of the world's five most populous countries, four are democracies, and if Indonesia and Brazil can elect their presidents by direct popular vote, there's no good reason that the far richer and more developed U.S. couldn't.
