Hey Steve,
Yeah, sounds like there may be a misunderstanding here.

Let me attempt to clarify.
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If I've been following this correctly, you feel that its the art, not the student, and I feel its the student, not the art. Am I correct? If so, what led me to say what I did, was your post about BJJ. I would say that BJJ has higher standards than your typical art. So, if thats the case, chances are, it'll probably produce higher quality students.
You could have other arts, in which the teachers are great, but still within that same art, you could have teachers that suck. The good teachers will produce quality students, while the lousy teachers will produce subpar students.
This is why I said its the student, not the art.
Hey, sorry, MJS. I missed this response. I see your point, but it's not quite where I'm going. What I'm suggesting is that BJJ has mechanisms within the art that discourage deviation from the standard. It's very difficult for a BJJ or submission grappling school to operate in a vacuum. There's an expectation that at least some of the students at every school will compete, and it's these students competing at every level from white to black that keeps belt standards consistent. It's not about higher or lower standards, it's consistent standards across the board.
My point is that this is systemic. It's institutional. While anyone can allege that BJJ McDojos are popping up everywhere, I have seen no evidence that this is any kind of a real problem. If the ruleset changes significantly, such as what's happened in Judo, there might be problems in the future. But that's a hypothetical at this point. Just to be very, very clear. I'm not suggesting that BJJ is immune to these issues. I'm only saying that right now, there are internal mechanisms in place that discourage these issues. I hope they continue to work. Ultimately, if a student walks into a BJJ school and trains at least 3 times each week, and the instructor is an actual brown or black belt in BJJ, chances are very, very good that this person will learn Brazilian Jiu Jitsu. REgardless of aptitude or physical conditioning, this person can't help but get better at BJJ. Just by virtue of being on the mat, sparring with upper belts, it's impossible to not get better.
On the other hand, you have arts like the Bujinkan, WC, TKD and even some branches of Karate, where folks within the art are lamenting the current state of the art.
So, back to your point. You're talking about instructors. I'm saying that good instructors in a broken system are doing nothing more than teaching a flawed system well. In other words, they're doing a really good job of teaching people crap. Why? Because the system is broken.
This isn't a point of debate. It's just common sense. Back to the math analogy I used. If the material I'm teaching is 2+1=4, the material is flawed. The only difference between a good instructor and a bad one is that the good instructor will teach that more effectively... doing an even better job of spreading the misinformation. And the only difference a good student will make is that he or she will internalize it faster... and likely be more resistant to learning the correct way.
Ultimately, I'm not saying that there is no difference between a good student and a bad one, or a good instructor and a bad one. I'm not suggesting that this doesn't make a difference. What I'm saying is simply that at some point we have to look at what we're teaching and learning and gauge whether it's actually meeting our needs. Does it work? Is the system flawed? Are we churning out more bad product than good? And if so, why? If the problems are chronic, then it's not the artists; it's the art that is the issue.
And conversely, back to the BJJ example, it's systems and processes in place within the art that maintain consistent standards. Here again, it's the art; not the artist.