No I didn't before, because I'm very confident in my stance on this subject matter.
I'm very thankful I just did watch it, though. This man is absolutely correct. We can only hope that he continues to speak and influence people.
This isn't a matter of putting something in a lab or writing an equation and saying "oh, well we have proof, the school system is bad." It's something that can only be discovered intuitively by experiencing the school system as a student, or by listening to other people (your friends, your kids, and so on). There may be no absolute mathematical proof that the school system stifles creativity.
But I know how poorly I have reacted to the school system, and I've been thinking about the problem my whole life as a completely honest, sincere, creative, passionate person. I am so passionate about this subject that I am enduring school so that I can become a teacher... I'm in my senior year of college and possibly have another 2 years after this for my masters. I also know a lot of people that feel the same way, and I know the highly questionable motives of many people at "the top." I have experienced firsthand how the current school system has worked tirelessly against me, rather than for me and with me. And the same goes for a vast amount of students -- and I have found these are the students who are honest. I also am always seeing better methods (by an extreme amount) for conducting education. They are clear to me. It may sound arrogant, but I can always easily spot which of my teachers are good at educating, and which are not.
For determining if the education system is working or not, we have to look at the world around us and at our potential future. Are we on track? No. Or perhaps we can even get to the facts: how important are arts programs in schools? Not nearly as important as others -- fact. Are artists and creative people valued and respected as much as businessmen and biologists? No, observable fact.
Education shapes society, so we must look at society to determine if our education is working. Our society is extremely unbalanced and prejudiced towards a narrow aspect of thought and behavior.
FWIW I have attended 5+ schools and have battled a severe psychological condition because I had it beat into me (and still do, even in college) that pretty much everything I do is wrong.