What idiom(s) rather than "talk of the town" can we use to mean a person who is not talked about these days? It may concern a celebrity who is old and not famous among young people. For example:
Few young people know who Chuck Norris is. He is definitely not the talk of the town anymore.
I'm also interested in what we can call a topic which is not so important anymore. For example:
Who to vote for isn't an interesting conversation topic now that the election is over.