Wow, you're so far off into your own beliefs that I don't even think a long drawn out reply would serve any purpose at all, Joe.
I'll just cover the basics then:
Mike Mangini is currently teaching drums at Berklee. He's not teaching heavy metal, as you put it. He teaches Jazz. He is on record as the world's fastest drummer, and has played with bands varying from the heavy metal group Annihilator to Steve Vai. Same basics also go for the other two faculty I mentioned. Not sure where you got the idea they teach heavy metal, since last I checked Berklee is still a school that focuses mainly on Jazz theory and technique.
"Golly gee, a whole four albums!", if you'd counted, thats EIGHT albums, and I said "at least". Throw in the fact that he has released and also TOURED with each of these bands, in a two year time span, and yes... it really is "golly gee". I'm sure if he were to stay home and do nothing but session work his resume would expand exponentially.
In short, you are still attacking the forms of music you don't listen to. I'm sitting here saying I studied and love jazz, and play heavy metal. How you figure the I am the one with the 15 year old mentality equating talent with my own tastes is hard to fathom. I see talent everywhere, in every genre. Even stuff like rap, or techno, which I personally cannot stand. Meanwhile, you easily dismiss an entire segment of the music industry due to your own tastes. You also dismiss a musical format that has a 40 year lifespan as a "fad". Jazz, by the way, only has about 80 years. Many classical purists would bash your own beloved jazz as just as much of a "fad".
In closing, I must poke at your statement that "Jazz is the king of all musical genres. There's a reason why it's always been referred to as music for other musicians to listen to". Lately, I hear that kind of statement thrown around a lot more regarding metal bands such as Dream Theater. Check out a band like Candiria: they play very heavy metal music with odd times, grating guitars, and screaming/rapping for vocals. The members all recently recorded an album under the name of Ghosts of the Canal, a straight up improv jazz album.
I've given more than enough examples. Anyone reading this thread can easily read my responses to you and see for themselves that there are plenty of people playing metal that are talented, educated musicians who are more than capable of doing plenty of cross-genre session, teaching, and studio work. Bash it all you like, but it's still going to sound like an aging Jazz enthusiast clinging to his own beloved formats of past. In no way does your opinion realistically represent the CURRENT state of the music business, no matter how much you believe the opposite.