I feel we have more tag-cleanup-request question here than what would be good (at least it's my personal idea).
Is it possible to make creation of tags more controlled (/ difficult,) by...
- increasing reputation required?
- have a review process for new tags?
- (setting up quality requirements - e.g. at 100 characters of description for a newly created tag?)
While I'm writing this question I've found this great asnwer, which explains background, however, I'm not really sure how effective those actions are.