It is a disappointment... though, to be fair, Disney was pretty much the only one of those stores to focus exclusively on exclusive merchandise (at least lately). Though I tend to think they focus way too much on what's popular. They did recently, at least of last year, had a Disney Studio line that actually had Mickey, Goofy, Donald, and various others on T-shirts and those fake printed canvas things.
That said, I bet if the SS store was still about, it would focus mainly on items you could get anywhere else anyway (unless they did some borrowing from Sesame Place's gift shop) and have few, if any, exclusives.
So, it's a sad thing, really, but you can find SS stuff virtually everywhere, even adult clothing.