NS has now in in existence almost 3 generations and over 4 decades. There is plenty of time for the PAP to do an analysis on it and for economists, socialogists, etc. to study it. If looked objectively, the whole of NS has been more negative than positive.
NS has changed the entire social dynamics of the country. Males enter the workforce at least 2 years later than women in their same age. By the time, they hit the workforce, their former female classmates are now their supervisors, and have been earning more money than they have while they were in NS. If a woman wants to marry a male in her age group, there is a good chance she will be earning more than he. What male will tolerate that.
The PAP has not dared to even examine the health issues associated with NS. NSmen that were injured or suffer some sort of disability in their NS days are not and have not been getting any form of medical health. In their later years, they will start to see these health problems crop up. I know several arty guys that have partially lost their hearings. I see some other people suffering from respiratory ailments, especially those that train in Area D where the dust is crazy. Not to mention people who hurt their knees, legs, etc. that now intheir old age is coming back to limit their mobility issues.
The whole job situation as stated by the above poster.
Lost of productivity on a national level. Imagine u have to keep around 35,000 NSmen under uniform for 2 years. That's about 8.75million man hours lost every year to unproductive non economic activities. If u look at the number of supposed skilled PRs taking up residence here, well, its closed to the number of NSmen that are serving. Really do u need so many PRs if there is no NS anymore?