A draft will never be implemented again for several reasons:

1. The cost of trying to enforce the law would be astronomical. The legal challenges alone would cost billions of dollars and waste years of time.

And that's just in the courtroom, the prospect of actually trying to physically round up people and then put them into a non-voluntary military would be even worse. It would the the left-wing equivalent of the kind of resistance you'd see if they outlawed guns and tried going door-to-door to take them. It simply would not work, half of the police would refuse to enforce such laws, armed resistance would be common, it would result in a complete breakdown of society if anyone tried it (which is why they won't.)

2. There's no political will to do it. Nobody with a lick of electability is going to support compulsory military service for the reasons stated above, it would destroy civil society.

3. The MILITARY doesn't want it. We no longer fight wars by sending masses of troops charging across No Man's Land, which is the only kind of war a conscript Army can fight in. Look at the problems we had in the Middle East with volunteer soldiers - we still had soldiers murdering, assaulting. and abusing civilians, how much worse do you think that would be if it was a pissed-off 20-something who was forced at gunpoint to go into the military? You think that's going to make him a BETTER soldier? No way in hell.

As a retired senior NCO, I would rather go to war with a platoon of soldiers who WANT to serve than a brigade of soldiers who were forced into military service and don't want to be there.