We already have tag blacklisting. That's great, and very useful. I would also like to have a related feature: marking a tag as "historical only".
For example, on Programmers.SE, one of the custom close-reasons is for questions that are about career or education advice, salary, or compensation:
Questions seeking career or education advice are off topic on Programmers. They are only meaningful to the asker and do not generate lasting value for the broader programming community. Furthermore, in most cases, any answer is going to be a subjective opinion that may not take into account all the nuances of a (your) particular circumstance.
So... why even have a tag for career-development? Because we have questions like these that should keep the tag:
- I'm graduating with a Computer Science degree but I don't feel like I know how to program
- I don't program in my spare time. Does that make me a bad developer?
- Is 4-5 years the “Midlife Crisis” for a programming career?
All of these are closed with "historical significance". I think we should keep these questions, tagged as they are, but disallow any new posts from using this tag. So it's not quite a blacklist.