All the demographics, all the basic math says the Shakers should be a one-generation-and-done sociocultural curiosity, a weird historical footnote.
But: 280 years. Somehow.
If a community is discoverable enough, and welcoming enough and kind enough and has a compelling story to tell then that community has a chance to not just survive but prosper through what should - by any measure or intuition - be _the_ flagship demographic nightmare scenario.
There might be a lesson in that somewhere.