Your right it won't, but NU Alcohol Studies Professors agree and so do I. Take a look at the majority of the world. Most places in Europe don't have a drinking age or at least not one that is enforced. Because of this, people grow up around it and learn to drink responsibly. The US has more alcohol related issues than most. Lets take a look at the current situation. You basically have three types of people growing up when it comes to alcohol. The first are the rebels who said F'it, I'm going to drink and I don't care about the consequences (ie. me), which is a horrible start. The second is one who decides to wait until they turn 21, and soon as it hits, its like a drinking competition (ie my college roommate). And last you have those who are not interested in booze and decide to never drink. Don't get me wrong, a transition would be very difficult and would probably put up more resistance than its worth, but in the long term the results would be different.