Originally posted by DotheBartman:
1. Fox would never let that joke on the air
There have been plenty of worse anti-Fox jokes and comments on Futurama and other shows on the network. (And NBC has occassionally let SNL, Letterman, and Seinfeld go even farther, going back to the days before Fox even existed.)
Unless they said something like, "Brought to you by the same network that manipulated the 2000 presidential election coverage to illegal put George W. Bush in office," Fox wouldn't stop them. (But wouldn't it be cool if they snuck that in somehow....)
2. The episode was, in all technicality, made before they absolutely knew FOR SURE that Fox wasn't going to renew it.
Changing the opening credits to insert a new subtitle is ridiculously easy. At least South Park and Clerks modified episodes in similar ways days before airtime, and I'm sure others have done the same.
3. I think the creators, as their last bid, would rather say something complimentary to the fans, or that gives a more joyful "farewell" then "we were killed off by network executives".
I agree with this one.
And I think they'll come up with something funnier, too.