Much like SS, seasons of ARTHUR are produced quite far in advance, and on top of that, the show is generally renewed on a season-to-season basis; I discussed this with Greg Bailey once, and he explained to me they never know whether or not they'll be renewed for another season until a WGBH staff meeting in the spring, and if they are renewed, that's followed-up with a writers' meeting in the summer. So, because it's always an uncertainy, they've done some of the season finales are series fauxnales, just in case they're not renewed.We've talked about how the show has had several season finales that could've easily functioned as series finales in the past. Wouldn't it be hilarious if the show just ended with a totally unceremonious, regular episode?
I also read Clifford is getting a reboot movie and show.When the series finally ends its run, there will have been at least, nearly 250 episodes aired (though I know many earlier episodes may never be rebroadcast again due to outdated technology and pop culture). I bet, with so many episodes available to PBS's disposal, I bet the show will likely continue airing on PBS in indefinite reruns for some years to come, like is the case with "Clifford". It depends on how long PBS's contract to air "Arthur" runs for. I find that, whenever a show ceases production, PBS airs indefinite reruns for a few more years, supposedly until the contract expires. Contract expiration plus lower ratings may have led to the demise of "Reading Rainbow" on PBS in 2009.
"Clifford" ceased production by 2005 (during the "Puppy Days" format) but there were five seasons combined covering both versions of "Clifford". I personally think "Puppy Days" replaced the original version because of Clifford's voice actor John Ritter's declining health in 2003.