(For those in the know, please correct me)
For a draft to be re-instated there would be a) a massive loss of life and/or b) a demand for soldiers which is much higher than the supply.
For the intelligence level: Either you are more educated than they are, or they are more educated than you are. In the case of Commissioned Officers, they need a 4 year college degree these days (dunno if it's changed, just know what I've read). For NCOs, they typically need a 2 year degree (or is it sophomore level college education?) OR they have been in the service long enough to attain their rank: In which case they definitely know their toejam. For any other education (which would basically be highschool/GED) you start off at the bottom rung in basic, and must work your way up.
That being said, I have worked for a Sergeant Major in a civilian job- and while I had a higher education level (in terms of college), there is no question in my mind... whatever he told me to do, I would of done it immediately. He had way more knowledge than I did when it came down to battlefield, and even other military, duties. I would of not asked, I would of simply done.
The guys who have been in the military long enough to get their ranks have their ranks because they are FAR more knowledgeable (education does not matter here) than any entry level recruit.
-SW