It might be conceivable on smaller subreddits, but on the big ones it would basically just drown everything into a sea of low-quality threads. I got the feeling that the vast majority of threads never ever make it to the "front page" of their subreddit.
Well, Robert A. Heinlein took the problem by the other end in Starship Troopers, military service is not mandatory, but required to be able to vote. So the only people that might be capable to rebel are eventually the only ones that won't.
With 25% youth unemployment, wanting to get a job doesn't mean getting a job. People give up after a while, and the resulting desperation is dangerous.
Makes different people do different things in response. Idle hands, etc. Throw in unwelcoming locals, radical preachers in the community, stories of oppressive foreign governments on your home turf, etc and I can see how idle youths find a call to arms appealing.
