I have a friend who teaches middle school Biology, and his students (in his words) "light up" whenever they watch a great TED talk about the similarities between chickens and dinosaurs or the way a gecko can swim through the air while falling based on something way up it's evolutionary tree. I think science-driven TED talks fill a great purpose in inspiring people that may not (yet) be scientifically minded.
Perhaps it isn't as bad as Bratton believes it is, because I can still show a good TED talk to my non-techy mother or father and blow their minds. My father is a deep thinker, but just doesn't come across deep or novel ideas very often in daily life. He is a football coach, so he just doesn't get a lot of that between dealing with kid problems and trying to win. TED has been wonderful for delivering him a nice, distilled idea to think about.
If nothing else, TED gives the general populace a starting point for the state of high-level research and a chance to think about something other than their mortgage or drama on twitter. And it does so in a manner that can be highly entertaining. It is sadly surprising how many people live a whole day, a whole month or a whole year without being inspired by anything at all. Anything that can inspire the public positively should be protected, refined and celebrated.