Actually Sesame Street has always been under attack, from the very beginning. There was a book from the 1980's, Amusing Ourselves to Death. It's a great book, but the author was concerned that Sesame Street was promoting too much of an instant reward system for learning. How could kids pay attention in school when there's no puppets or music to reward them for learning? He wasn't really against Sesame Street itself, just skeptical as to whether Television as a medium was a realistic or effective learning tool.
Yeah! Why would ANYONE prefer a loving giant yellow bird and his wonderful friends using magic and mayhem to old hags that yell at you everytime you draw the letter A slightly wrong or coloring outside the lines? Seriously, remember that episode of the Simpsons where Bart goes to Kindergarten and the teacher seems to single him out and make him feel terrible? That was like 90% my grade school experience.
On the one hand, sure... there's no competing with television and what it can do, but on the other hand, our education system is screwed up, even in the "good" old days. But on the first hand again, it's human nature to want to be fascinated and entertained. You remember funny or strange facts more than the things you have to know... and I mean, EVERYONE loves science when things blow up and chemicals change colors, but no one likes calculating chemical change formulas. I learned more science from Beakman and Bill Nye than my science teachers. I liked the lab studies, but I HATED lab summary writing. Seriously, I almost would have gone into science if I didn't hate math so much. Plus, you can't invent anything fun in reality.
But the author of that specific book criticizes something that has a point. He's calling out the love affair with media, questioning things. The guy who;'s writing the OTHER book is just throwing more pundit oily rags on an exploding fire of polarization. Upper class conservatives will laugh it up, lower class ones might actually take it seriously, and imagine some random conspiracy.