I think that's sort of the nature of a kink meme/fandom, though? Like, you read through thousands of prompts and one of them catches your eye, so you start a fic for it, maybe write an outline with some stuff that you're really excited about, but then you find another prompt, or you join another fandom, or your schedule changes and you no longer have time for writing fanfic. I think that unfinished fics are the price we have to pay for encouraging an anonymous, volunteerism-based fan community to provide us with entertaining stories.