I too have been noticing a growing lack of faith in the future of civilization. Usually it isn’t so clearly articulated however. I think for most people it is a result of the ever-increasing difficulty of living in this system - the lowering of wages, the increasing cost of living, etc - and growing awareness of climate change and the basic unsustainability of a civilization based on fossil fuels. I think it’s natural that the more people feel exploited, the closer they get to losing their homes, going hungry, etc, the more they will question things.
I also really agree with George Orwell:
Why should one feel it to be intolerable unless one had some kind of ancestral memory that things had once been different?
(I like that quote enough to make it my signature - it explains what I've been feeling most my life).
I think the farther our culture moves away from what is natural (the more unnatural it becomes), the more this vague feeling of “wrongness” and a desire to return to an older, more natural way of life begins to surface. Also, the worse things get (the more the planet is destroyed), the more it becomes apparent that we are heading for our own destruction unless we can chart a new course.
Also, I believe that we are in a pivotal time in history, of massive, rapid change, so it makes sense that the Collective Unconscious (or whatever one wants to call it ;)) will reflect this.
I think that this “mythic thread” CAN provoke change, but only by prodding people to action. Just thinking/feeling this inside oneself is NOT enough, IMO. In fact, I think that believing that it IS enough could potentially be a barrier to change, if it leads to people NOT taking any further action.
But it is a great start - and possibly even a necessary prerequisite for change - because someone surely won’t take action to change themself and the world around them if they don’t believe that any thing needs changing.