Some observations I'm throwing into the wrestling ring.

The system works but it is a broken one. The system is designed to make money first and promote education second. It should be helping students but the system doesn't directly. It exploits students and their families for money. It is an old system and would take a miracle to change it now. We need an educational Jesus to look into that one.
Some schools hire anybody. Let's be honest. There are some schools that would hire a corpse if they could figure out how to make it smell better. Is that the fault of the corpse? No, it is the fault of the school.
Does having a teaching certification make you a teacher? No, but it helps. Some people can teach and others can't. I've seen people with teaching certificates fail in front of a class and people fresh off the plane excel. Though let's be honest and say that if you went through the trouble of getting a certificate you probably are a good teacher or at least want to be one. There are a lot of people here for the one year travel party experience but amongst those are people who care about their job as well. So, long story short everybody is different mmmkay.

The South Korean Public Education System is going to go back to teaching with Korean Teachers only. I believe it is mainly to save themselves some money and save a little face on their old promises. In about 5 to 10 years the trend will return again to hiring foreign teachers in schools. Yeah, they will do okay without foreigners and what they can't do they will cover up by changing their methodology etc. They will always need private or public sector instructors for advanced students to learn advanced english.
One thing that shocks me is how many foreigners view a one year contract as the potential to be a long term career. Most of us are hired as one year employees. We are subject to the rollercoaster nature of our contract limitations. Currently it is a little rocky but it is not any worse than it was in the past. It seems to me South Korea is a lot tamer than it was about 10 years ago for those let's say "Prisoners of a Wonderousland" (Purposely Misspelled

) I remember a time when you would see or hear at least one shocking abuse story a day. Now it seems to only pop up every other week. Luxury pure luxury.
As my constipated uncle once stated, "This too shall pass."