Listen... Canceling SS isn't like canceling something like Hey, Gabba Gabba or Dinosaur King or something like that... this is a show that's been around 40 years. Look at the news when Mr. Rogers ended, and that was a voluntary retirement. If even the slightest rumor that it was going to be taken off surfaced (no matter how untrue it was) there would be lots and lots of angry letters begging them to keep producing it. Mike's right. It'll continue as long as it has an audience, and if adding a segment causes it to lose appeal and viewers, it's taken off swiftly.
Remember that patronizing "Get up, it's time to play" stuff? That lasted only one season. It probably tested poor, and there were complaints. We have to worry about an Abby segment being successful if anything.
And yes, overexposure kills a character. I've said a hundred times that there's a difference between the great stories, TV shows, short films, etc of Winnie the Pooh, and the millions of bean bag toys that old women collected.
There is so much potential for character development and exploration on Abby's part. For instance, an episode where she gets extremely depressed after not being able to do magic right, and she decides not to bother trying to be a fairy anymore... and then her friends tell her to keep trying... or an episode where one character gets extremely jealous of her magic, teaching the all too important lesson that kids can't have everything, and they can still get along. I really want to see more of that. Even Abby in Wonderland was a nice Character exploration with the message to try not to grow up too fast.