Drone training is expensive, and still requires that pilots meet physical training requirements. If the conditions existed to actually reinstate the use of the draft: it'll be a more conventional framing of war; and the majority of draftees would be frontline combatants unless they already had advanced technical training that could be exploited. Comp-sci majors and car mechanics would go into the technical side, while the art majors (and brick layers, and prison guards, farmers, accountants, janitors and just about everyone else you could think of.) would get a month of boot, a slap on the ass, and if they're really, really lucky: matching uniforms and weapons with ammo. Because if they actually get to the point to start calling up the selected service lists: the jive has already hit the fan and chances are the global economy is performing the single most epic stage dive turned crater you could think of.
There is no draft in canada. I didn't have to make any pledge to the military industrial complex at any point in my life. We had conscription during the second world war, and the government swore to never use it again (course, they also swore the income tax would be lifted when the war debts were paid, and we all saw how well that went.) but it remains an option and if things get so bad they need to apply it again: just run. They won't be able to waste resources hunting you down, and even if they did: it'll probably only be a year until the government collapses anyway.