Dr Dave notified me about an article on Animation World Magazine called "What Makes a Hit a Hit?". For Futurama fans, page 3 is of special interest as it recaps and details the situation Futurama was in compared to The Simpsons and Family Guy.
Talking about the possible resurrection of the later, Cartoon Network's Mike Lazzo tells us
Family Guy has sold a large number of DVDs for FOX, so there has been interest to a degree in that property. We've been talking for months about that type of thing [a joint effort] with FOX. [...] There hasn't been an equivalent situation with Futurama to date. It did quite well on DVD but didn