Mmmmm, I don't know about this, it seems you might be assuming some things here...
For example, you mention several times about someone not caring about history...did this person say that specifically after saying they did not know of the people you were talking about?
Also, I am a self taught pro, won quite a few awards, several magazine covers, two times in Life The Year in Pictures and out of all the people you mention, I knew of Weston and none of the others as of 10 years ago. I cared but I simply did not know who they were because they were not current like Nachtwey, the Turnley Bros, Allard, Harvey, etc. the latter are who influenced me at the time because that is who was currently in the spotlight.
You have to give a young person credit, there is so much knowledge influence beyond the textbook or classroom these days that they ultimately have to follow their internal compass post info barrage.
I love what I have learned of the people you mention, enjoy several of their more important books, but had I known of them 20 years ago, I doubt they would have influenced me or my work much as even in the late 80's, they were hardly current.
Give the guy some credit, the age of photogs who will make that kind of mark are looooong gone sir, never to return.