Intros set up the show and can often be what people remember most about the show. I'm liking American Horror Story's idea of slipping episode references into the intro, references just vague enough that you won't get them until the episode is aired. Some intros can die in a fire, like for sitcoms. But then I don't watch sitcoms anyway. For dramas and sci fi shows, the intro can either be the setup that gets you jazzed for the show coming up or they can be that last 30 seconds you get to use the bathroom or grab a snack. On DVD, whatever, you can skip it if you want to. For my DVD collections, any series that I'd buy on DVD I enjoy watching the intro before each episode.