I share this concern/curiosity 
I think the reasons are:
- The Zeitgeist film series were released more than 10 years ago, the hype train is over. The film series were the driving force behind the momentum. Peter Joseph (the director behind the film series) hasn’t released a new film like Zeitgeist since. There is a new one coming though. But I doubt it will cause as much hype as the first 3.
- Many people were onboard because of anti-establishment sentiment. TZM is not a movement like that. Some still cause such noise. Which created a bad name for TZM, but also causes confusion. Some think TZM is a conspiracy group or anti-establishment movement. We’re not. When most of those people left, the movement shrank as well.
- Unreachable goals, some people seemed to be locked on big projects, that for obvious reasons would not work out and then they lost their motivation.
- There is not enough attention for the decentralized nature of TZM. The people in charge of the social-media, and thus the exposure, don’t promote self-leadership. This was different in the past and caused a more diverse back and forth of activity. Now the TZM socials only broadcast, but don’t seem to create an atmosphere to also receive.
- The Internet has changed. People are more distracted with short attention span entertainment on social-media and are busy fighting each other in the comment section
A forum like this works, but it has less momentum nowadays because that addictive ingredient and drama is missing.
There are ways to resurrect the movement, to a certain degree. If the active people invest about one hour per month on their local chapter (no rush). Such as setting up a website, organize people, mingle with like-minded people and do some social-media exposure about this work and share the progress with the movement in Reports. It will not be like the old days, but it doesn’t have to be. We need quality, not quantity.
That’s described in the chapters guide: