I submit that the success of 'South Park' helped turn cable television from a boring wasteland, into the
broadcast tv destroying monster it is today.
[ Warning: the link contains a quote from a 'Mr. Beavis'. Seriously, it's his real name ]
Do you remember Comedy Central before 'South Park' appeared? It was boring. Re-runs of stand-up comics (originally done for HBO), and the millionth showing of a Richard Pryor and/or Gene Wilder movie. Richard and Gene are great, don't mistake that - but a comedy channel needs more than that to be interesting.
After the success of 'South Park' the world now has cable channels producing their own high-production value (read: expensive) series. And they're good...really good. Have you seen 'Farscape' on the Sci-Fi channel? Even folks who don't like the show readily admit the production value on the show was through the roof.
Have you seen 'Monk'? A successful show that (for once) doesn't rely on nudity, violence, or even swearing. HBO should take notes. So should broadcast tv.
Now things are coming full circle and the now-successful cable channels are suffering from the blunders of broadcast tv. 'Farscape' was cancelled at the height of it's popularity. It's making a brief comeback in some sort of mini-series/movie/thing (I'm not sure what it is). But the show was cancelled despite being hugely popular.
Back to the good old days.