What shall we do with questions tagged with the fantasy tag?
I think there are three separate questions.
Are there any questions that would be tagged fantasy that are on-topic? In particular, questions like this one, which aren't about fantasy per se but are about how fantasy sports affect real sports (and as such are a question about real sports, just like "What effects do the rising water levels in the artic have on the baseball season" would be on topic (obviously if written better). And if so, do we want a fantasy tag for those (maybe fantasy-real-sports or something?)?
What should happen to preexisting questions about fantasy? Close and delete over time? Or keep them around (historical lock??)? In particular, this has some impact on 3. below.
Do we want to keep the fantasy tag around, specifically to include a THESE QUESTIONS ARE OFF TOPIC reminder in it? If so, we have to keep at least one question around.
Yes, but I'd rather not have a tag just for them. I don't think they're common enough to justify their own tag, and I think if they're really on-topic, then another tag is sufficient (like finances or something).
Close and delete over time, excepting one that is kept around for 3.
Yes, keep the tag with an off-topic warning.
The guidance from network meta is that
Questions should not be historically locked if they [...] Have little or no redeeming value.
I'd say that applies to the majority of our questions tagged fantasy - none of them are great questions, even about fantasy sports. The exceptions in my mind are 1, 2 and 3 which I'd argue are on-topic as their primary point is about real sports, not fantasy sports.
Hence we should close, and then probably delete, the rest. The three on-topic questions can stay around in order to keep the tag alive.