I have decidedly mixed feelings about the article. I will be the first to admit that the rise in yoga's popularity has led to an increase in inexperienced teachers and classes that cater to the masses. As a student, you have to be discerning, which is pretty difficult if you know nothing about yoga in the first place. Even when you have a good teacher, you have to resist the urge to follow their every instruction. It's your body and your practice. But I think that's true for anything involving a teacher, trainer or coach. You have to remain willing to think for yourself.
But I fault the article for making it seem like yoga is inherently dangerous or somehow unique in causing injury. Most physical activities can lead to injury if done to excess or incorrectly. Heck, they can lead to injury even when we're being exceedingly careful. Stuff happens, and sometimes we don't know our body's limits until we exceed them.
So, while I appreciate the caution suggested by the article, I think it should be applied equally to most of our physical pursuits.

