Your idea is good, regarding the quality of translations. However, I believe that, within a group of professional, there are people that will be superior. Thus, there is no how the quality of work would be equal.

Some people have years of experience in translation, while some aren't. Yet, anyone can get better if the chance is given. As I have mentioned in my comment above, things are not really perfect now, but it would be better to look for a less strict way.

Also, anyone that provides way less quality could be replaced since we want good translations. We shouldn't nurture poor works.