Why was Futurama cancelled?

[Tosh]

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Futurama is a "Sci-Fi" type cartoon, Sci-Fi shows have a somewhat limited audience although the fans tend to be much more hardcore. I'm not going to try and compare Futurama and Star Trek or anything like that, but I think the Simpsons is much more mainstream which I'm sure helps out with its popularity.

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I kind of don't buy that. For a start Star Trek is one of the most popular programmes of all time and I honestly don't think there is a parallel in the types of viewers for both shows either.

Maybe there is a bit of a benefit to The Simpsons being more 'mainstream' but I do think a lot of it is to do with it being around first.