Movement collapse is the process that causes social or intellectual movements to become extinct or otherwise destroys their potential.
Aird, Michael (2020) Collection of EA analyses of how social social movements rise, fall, can be influential, etc., Effective Altruism Forum, March 26.
Many additional resources on this topic or related topics.
Baron, Rebecca (2019) Movement collapse scenarios, Effective Altruism Forum, August 27.
Sempere, Nuño (2019) Why do social movements fail: two concrete examples, Effective Altruism Forum, October 4.