I don't think everyone having wireless devices that connect to a global information network in their pockets at all times is something one could've really foreseen in 1978.
and, even so, it's not as though it's really feasible to make any sort of shock-to-the-system sentiment widely and broadly heard, today, while abstaining from violence—even our modern societies are still trying to grapple with the question of, how much violence and destruction is justified in order to make a point about something, as seen in the last few years.
had Kaczynski chosen peaceful decades-later contemporary Internet discourse as his means of promoting his ideas, he'd simply be tarred and feathered as an "alt-right" nutjob, just like everyone else with views that contradict the present Western civilization status quo. The System has gotten extremely efficient in perpetuating itself, and silencing anything resembling Actual Dissent.