You would create a huge “anti-war” movement and fill the military with people who don’t want to be there. The demographic I want in the military is people who want to be there. The whole “anti-war” movement in Vietnam was really an anti-draft movement. Once the draft ended they didn’t care what happened to Vietnam. That’s why it’s usually lefties who want a new draft. They long for the “anti-war” movement of the sixties, so we won’t be able to fight when we need to. And we don’t need it. Volunteers beat conscripts every time.
The draft produced some of the finest soldiers this country ever had. Things got bad in 70 with druggies, In fact the damn pot smokers even started their crap in our SF camp around Spring 69.