Sadly, that's not quite correct. Adults might get sick of reruns, but apparently kids love them. I don't see why, but then again we live in an age of internet and DVD's, where we can watch something once and be content to watch it again in time.
But aside from that, SW really can't help reruns. I'm sure they'd love to have more episodes a season and more Elmo Musical and Abby School segments... but that's like saying I'd love a new car. It's a budget thing, they have to save money where they can, especially considering the scope of what SW does. And creepy superimposed baby head commercials aren't quite doing it.
Best we can do is donate to PBS and hope it goes to kid's programming instead of that British midwife crap and buy as much Sesame Street merchandise as possible. But then again, we'd need money to do that.