The legacy of Six Feet Under isn't quite as strong as The Sopranos and The Wire - which constantly get named. When has the last time it got rerun on cable? Since before Bravo was into cooking and housewives?
The Wire is like that cult book that keeps gaining a new audience because it wasn't over exposed and the constant water cooler show. People don't feel like they've missed out on a trend when a pal gives them a copy of the first season boxset.