To keep it relevant, they would need to keep adding items that in some way would relate to the FATE.

I know in the Dravanian Forelands the Coeurelinga(or whatever her big moose-headed name is) - the FATE "Coeurls Chase Boys Chase Coeurls" gets a bunch of people when it is called out. I only did it recently, and we had a good 20+ people show up for it. I completed it on 6/25/2017, never before had I seen it. So later on, there will still be people who jump on the chance to do it(or to just help others).