It's a rare thing to have a show that remains consistent over a long period of time. Most just run out of steam eventually, while others hit the ground running and then spectacularly proceed to leap a gigantic shark-shaped hurdle, much to the annoyance of critics and everyday viewers alike.
The fact of the matter is that quality TV shows struggle for consistency, with only a select few series managing to depart the airwaves with their accolades and fan favourite reputation firmly intact. The vast majority, however, linger on largely thanks to the followings they developed back when they were, well, good. It may hurt to say it, but sometimes an early cancellation can actually be a good thing, and - as was the case with Futurama - it can allow showrunners to end their creations on their own terms; unlike The Simpsons, which, y'know, continues to live on as the medium's own veritable yellow-tinged Frankenstein's Monster.
But it’s not just animation we’re talking about here; there have been plenty of live action darlings to have fallen foul of critical consensus. And, with TV being as popular as it is, it’s a trend that’s unlikely to subside.
You never know, some might manage a return to form down the line. But for most, it’s clear they’ve been thrown one lifeline too many.