The states that are getting people excited about the national popular vote compact are swing states: Pennsylvania, Michigan, Arizona, Wisconsin, and Nevada. The reason swing states exist is winner-take-all. Those states ignore about half of their voters every election because they like being swing states. It gets them attention, and concessions. It's a way of throwing their weight around at the expense of the minority of their voters. Swing states don't have to be swing states, they can stop whenever they want. All they have to do is split their electoral college votes based on the results of their election, instead of ignoring the slightly less than half of their voters.