There's the rub, now isn't it? Sounds like you think a draft is alright during peacetime, which is quite natural, but during a war, or other military action, it's a bad idea. Nobody really wants to be shot at when you come right down to it. Even some of us who volunteer raise hell when we're actually sent out to fight and die. The main reason for this idea to come up now is two-fold...
1. We folks in the military are being run into the ground. Long deployments take a heavy toll on retention. We need some more 'bodies' to give us a break.
2. Too many people out there take the current administration with a grain of salt. Some folks actually have a legitimate complaint, while others simply spout hot air, and will never do anything to change the status-quo. Give them a couple of years in the service, and show them how all their rights were earned and maintained. Give them something more than just the right to whine and complain. Give them reasons to see beyond their own immediate selves. But, most of all, give them a reason to vote.
I'll let you know this much, though. By the time any draft is implemented, this war will be long over, and we'll be bringing troops home. A draft is not instantaneous, and can take years to get up and running.