It's an interesting question. Probably falls under the "teach a man to fish..." adage nicely. If you provide a functional tool that has reached the goals you se

It's an interesting question. Probably falls under the "teach a man to fish..." adage nicely. If you provide a functional tool that has reached the goals you set for it where's the obligation? Exotic features that are outside of your goals simply do not benefit your interests in the project. Someone has to make it worth your time and effort to continue otherwise you've provided a good platform that seems to be well documented and capable of being taken over by another interested party. If that never happens then you're probably right that the project is finished. Maybe find similar active projects to steer your users towards.