Of course this ABC special, because ABC is owned by Disney, is wholly and blatantly self-promotional as well as self-congratulatory. But so was Disneyland, the weekly series ABC launched 60 years ago, and that certainly was worth watching, and proved very, very durable as a pop-culture entity. So, I suspect, will Frozen, which, 50 years from now, is likely to have little girls singing along to “Let it Go” with their three-dimensional holographic Disney playmates.