Of course part of the delusion is that there has never been a time when everyone served. Never.
There was never even a time when all males served.
No, not even World War II.
When you have a population the size of ours there is no way a "no exceptions national draft" would work. The 3.5 million number is how many young people graduate from high school every year. To have a system that would take that many people in every year, train them, feed them, house them, clothe them, would be a system that would be so enormous that it would run the country.
We would at any one time (assuming two years of service) have 7 million draftees in the military would have to be 10-12 million. Considering how much fuss is kicked up about the military budget every year (between four and five percent of GDP) does anyone think a growth of 1000 percent would be greeted with cheers?
40 to 50% of the national GDP being spent on the military is as much or more than we were spending in WWII.
Those here, supposedly for this obscenely STUPID proposition, are not only delusional, but haven't considered ANY of the relevant problems with it; especially the cost.