Not that many really good ideas worth spreading?
My Facebook friends have been turning on TED and TEDx for a bit mostly because they have been pulling talks that don't fall within the traditional notions of science. I can't say I blame them -- friends and TED/TEDx. Especially when few people really understand that TED and TEDx are difference conferences altogether and TED/TEDx does not respect that many in their audience are rational, spiritual beings. For example, pulling Sheldrake's talk is really unfortunate as his is an interesting perspective on Eastern and native peoples spiritualism in Western science clothing. (Others that were pulled seem to me to be little more than entertainment presentations. That is, I don't care.) With that said, TED is a business — they sell conferences — and so they can edit (not censor, only governments do that) as they want. The challenge is for another conference organization to build the same name recognition as TED but in areas TED fears to tread. Let's look for them and support them.
In the end, however, I think what might be happening is that there simply are not that many really good ideas worth spreading!