t's a nice idea, but has lot's of problems. For one, it creates a central authority...what happens when that authority is compromised (perhaps shutdown by a gov't)?
This organization will be absolutely legal as well as Wikipedia or Apache Software Foundation. It would be difficult to shutdown it. Also, there may be more than one such organization. For example one in USA, one in Europe, one in Russia or China.
Maybe better indicators would help people estimate the fundamental and speculative demand. That in turn might give some people more confidence that there actually are real support levels for the price of a bitcoin. I'm not sure exactly what kind of indicators would help however.
Yes, it's a good idea, we should think about it.