The issue of too many tags has been brought up before (Should tags for individual movies be encouraged) with the general opinion (from what I read) being that unused tags get removed automatically. However there can still be a large amount of tags created and we already at this time have 17 pages worth of tags. I think Sci-Fi/Fantasy has 25 pages.
I suggest creating decade tags such as 70s and 80s to cut down on naming every movie or TV show out there. I think franchises or stand out movies should still get independent tags. For example: Instead of a "Who's the Boss" tag it would have 80s and sitcom. However "Happy Days" would have a tag since it's a sitcom from the 70's about the 50's. "Inception" is a standout movie and deserves a tag all its own as there are many questions it inspires, but "Planes, Trains and Automobiles" although a great movie and classic comedy could be covered with the tags 80s and comedy.
So what does everyone think?