^Well, yeah, but that should've also been true in Cubert and Dwight's appearances in the movies and the previous season, but they were still stuck in perpetual preadolescence even though it was explicitly 8-9 years after we first saw them.
That's something that bothered me about Futurama
. In cartoon sitcoms like this (Simpsons, Family Guy, Flintstones, Jetsons
), the passage of time (or lack thereof) is excusable since no calendar year is given. But this show explicitly started in late 2999, and the show has counted in "real time" ever since (the season opener says it's now 3012).
So 13 years since Philip J Fry woke up in the future, yet our cast hasn't aged (or are trying very hard to look/act like they haven't aged). Would it be so bad if Cubert and Dwight were grown up, Farnsworth was a talking head in a jar (or on a robot body), Amy's slutty party-girl lifestyle was starting to fight a losing battle with maturity (isn't she supposed to be married to Kip?) or Zapp found himself promoted to Admiral and trying to find ways to escape his desk job and get back on his ship? Incorporating time into this show could open up some intriguing story possibilities.