This is a suggestion for a periodic audit of tags now that there are tag badges. Having just looked at my own "tag" list, there are a number which must be of limited use. But since tags were invented, we now have badges for tags, and these could be data for an annual audit.
For example, any tag with a cheerleader (Gold badge holder) should be retained. Any tag which has been in existence for six months an has no associated bronze badge holder should be considered for deletion/amalgamation.