It shouldn't be about demographics. The draft is the best leveler. It's a check and balance on rogue policy. Bring it back and we'll get the bravest willing to do something patriotic. Everyone of age should be forced to make a choice, which is based on some concern over what's the right thing to do. A lot will chose to serve on the front line, and some may protest against it and be willing to take the consequence.
But a spoiled rich kid somewhere might go to the front of the list for a cushy job flying outdated jets in the Texas ANG, and eventually be a president... kind of like a Grimm fairy tale.