Many governments abolish conscription over time because citizens precisely don't agree with that (as of 2011, countries with active military forces were roughly split in half between those with some form of conscription or emergency conscription, and those with no conscription even in emergency cases - http://chartsbin.com/view/1887)
This feels much closer to how I experienced EA student groups 5-7yrs ago - e.g. Tom and Jacob did exactly this with the Oxford Prioritisation Project, and wrote up a very detailed evaluation of it.