I wouldn't worry about a draft. We're using technology to supplement our troops more every year and trained professional soldiers work better. Psychology studies have shown that even basic training works better with an all volunteer force, probably why the marines have always been all volunteer. It helps with the tearing down of the ego thing if you volunteer to do it.
And really, what good would a draft do in a nuclear war? More troops aren't going to affect the bombs at all. Flash of light brighter then the sun followed by a shock wave of expanding energy, whoosh. No muss, no fuss. No, I don't see any point in returning to the draft.