The problem with Supreme Court and lower court decisions since at least the New Deal era is that previous jurisprudence and traditional interpretations were abandoned in favor of a view of the Constitution as a living document. In order words, it means whatever the justices say it means, rather than the original intent of the framers. This concept has led to a massive expansion of Federal power at the expense of states rights and individual liberties. Even jurists like Antonin Scalia and Robert Bork, generally considered conservative, accept the "living document" view of the Constitution to some extent. Also, many "law and order" advocates look at the draft as a type of right-wing social engineering and therefore approve it even if they scream at left-wing social engineering like affirmative action.
If we are to be true to the Constitution's original intent, there cannot be a Federal military draft unless it is amended to do so. Anything else is just another example of the "penumbras" that liberals see in the document and that conservatices decry.