This is great history, however there is more to the craze of mountain biking than these tales of pioneering legend. History can be taught as 'kings, queens and their wars' or it can be told in terms of economic and social things. With the mountain biking craze not much has been written about why it did take off like it did - really very few people knew who Fisher, Breeze, Ritchey et al. were. People just wanted a mou…
Inline skating (aka Rollerblading) came out of nowhere to become a very popular activity by the late 80s or thereabouts. (It predates that but that was around the time it really took off in the US.) Today, my observation in at least the places I live and visit is that it's essentially gone away--in spite of the increased availability of paved rail trails and the like.
Recreational kayaks have replaced canoes to a large degree.
Paddleboards are probably the hottest new thing in the watersports arena.
That said, you're right about both the technology aspects and the fact that road cycling was less prevalent and generally more dangerous at the time mountain biking came onto the scene.