I don't think anyone has a problem if they showed old segments in new episodes. Somehow I feel SW keeps painting itself into corners they desperately want to get out of. It's the problem of classic skits not fitting into the show, not by design, but by their time constraints. I keep forgetting to get exact timings of each episode... but a street story that's about 15 minutes long, an 8 minute Abby, a 4-5 minute Ernie and Bert/Super Grover segment, a 15 minute Elmo segment... 43 minutes out of 50 something minutes right there...NOT counting Murray tune ins. Let's say that's another 5 minutes combined... there's barely any room for anything else.
I actually don't mind the lack of old material in new shows BECAUSE they managed to make them available on Youtube and their own site. If they were hidden in a vault away for ever, and severely penalized anyone who has an unauthorized YT upload, then and only then would I be angry at them. SW does realize it has an older, nostalgic fan base... that's something to be thankful for. Scary thing is, Barney's retro now and we're seeing adult T-Shirts with his ugly purple mug on them. I wish I never saw that. That was creepy. And it was in Spencer's next to the aisle with the... oh Never mind. if you been to Spencer's you know what I'm talking about. What was I getting at again?
Ah yes... SW realizes it has a nostalgic fan base that wants to see all the old stuff they can't fit into the show anymore. And I'm certain a lot of the ones who are parents expose their kids to the older stuff anyway. As for the show itself, the writers are trying their darnedest to make everything work. Abby, while plagued with reruns, is sharply written and more enjoyable than it needs to be... Super Grover 2.) is impossible for me to not laugh at. We got very stinging parodies of stuff like Glee and the Spider-Man musical this year. There's plenty of adult appeal still there. The problem is the balance is quite often out of whack, and I still think EW is sinking the show's potential.