This is an interesting topic, one that has grown out of the Driscoll-plagiarism conversation.
The Internet has disrupted traditional channels
Music, videos, newspapers, magazines, journals, etc. Information now passes with so much less control and cost. Gatekeepers must pivot. Gatekeepers are not always bad things.
The Transition is not over
Books will survive. How will they be used? A lot of good ideas can be gleaned more cheaply and efficiently from briefer formats, some cannot.
“Good” is in the eye of the beholder often
This is an old problem of course. Fluff in publishing fueled by mass popularity predates the Internet.
Time Changes Things
Those seen as important today may not be who is seen as important from today 40 or 100 years from now. This too predates the Internet.