Those three cities alone make up enough of the population for any candidate to win by simply catering to them (as they will ALWAYS have supporters no matter what in other parts of the nation).eliminating the Electoral College results in ALL candidates catering to New York, Chicago, and Los Angeles to get elected
You would be shocked to hear that there are lots of other places in the U.S. than just those 3, cupcake
There is a reason our founders set up the system the way they did. Because they were exponentially smarter than you are and they have lived under tyranny and understood the dangers of it.