"More than half of a tiny and almost certainly unrepresentative fraction of Singaporeans" would be a more accurate description. Arguing from headlines seems like it must be an uncomfortable place to be.
The CIA World Factbook estimates a 1.5% net immigration rate for Singapore in 2015. They don't seem to break out immigration vs. emigration, so I'm not sure how frequently people leave, but a quick glance at Google results for "singapore emigration" suggests people leave frequently enough for some pundits to consider it a problem, which makes it seem improbable that doing so is all that difficult.
Singapore can be a very uncomfortable place to live if you're Singaporean, poor and unskilled, which is also precisely the combination that makes it virtually impossible to emigrate.
Every now and then the gov't media accidentally lets the veil slip, as in a story about a retired old lady who worked as a hawker centre table cleaner with wages of around S$190 per month (around US$100, this in a country with higher cost of living than the US) and slept in a pile of cardboard boxes on a public housing block's "void deck" (outdoor forecourt). This wasn't the story, mind you, since this is what happens to you if you have no retirement funds or family to support you in Singapore; the story was that somebody had stolen her S$90 of savings.
That people describe emigration as a problem says something. Most citizens of any given nation won't leave, and generally feel like they can't leave, because emigration requires either resources and skills or extreme desperation.
Virtually all nations of the world put a fairly high bar to immigration. For this reason, a nation's willingness to allow immigration at all tends to determine it's immigration rate since there are numerous areas of the world whose citizens are in extreme desperation.
You observe this from this chart of world immigration rates. Sweden is a pleasant destination for immigrants, Jordon and Libya less so but both have high immigrations rates.
The original argument was "Singapore is not for everyone" and my point that Singapore pretty much is for everyone who's a citizen without a whole lot of resources. It's not a matter of taste akin to an exclusive club.
The CIA World Factbook estimates a 1.5% net immigration rate for Singapore in 2015. They don't seem to break out immigration vs. emigration, so I'm not sure how frequently people leave, but a quick glance at Google results for "singapore emigration" suggests people leave frequently enough for some pundits to consider it a problem, which makes it seem improbable that doing so is all that difficult.