After seeing that tribute video Sesame Workshop did to honor Caroll Spinney, I was thinking that's the kind of thing Sesame Workshop hasn't done for its official YouTube channel, and hope they can do more with other performers and people involved with the show.
But now I wonder if maybe they were planning such a series and it's a coincidence that it was uploaded right when Caroll announced his retirement. Unless he already talked about it to Sesame Workshop and the video was put together and they were saving it until he retired. But I noticed that at the beginning, Guy Smiley refers to Spinney as the guy who plays Big Bird (not played, though he was still to do the characters for one more day), and there's no mention in the actual video (just the description) that he's retired.