QUOTE (chalice @ Dec 6 2007, 11:23 AM)

The League of Gentlemen had 2 series and a movie, not to mention the radio show which preceded it though.
I would argue that it was waning towards the end of the second series. The cast/writers knew when it had run its course and went on to other things.
You're my wife now!
The Prisoner was a great example of knowing when to stop. McGoohan didn't even give us a coherent conclusion." Like it or lump it, suckers" was his general demeanour and I love him for it.
And, that was 11 episodes more than McGoohan wanted to do anyway - but the only way he could get it done was a compromise with the studio. That is why some of the episodes, while still superb, seem a little bit like "filler" - but even the "filler" episodes are heads and shoulders above most other episodes from other series.
But he definitely did it right, by NOT turning it into some corporate cash cow. Heroes is not really in the same category, though, because the Prisoner was about a single individual and a social/political statement. Heroes is about multiple people, multiple stories, ideas, etc - hence the idea for Origins, showing yet more heroes that don't have to do with the "main" storylines, but still relevant to the world and a good way of exploring new and potentially interesting storylines.
Plus, we are still really in the "setup" phase of the show - Last season was introducing, who are these people and what can they do? And now, first half of second season is "What happened to lead up to this?" and, if they do it right, Volume 3 will show us exactly what the battleground is and how it will take place.
There are tons of ideas to pursue still, so i disagree that a single season or even two or three would be enough to really exhaust the material.