Do you want to bet that one year from now, if this organization is still up, many newbies coming by will believe "Bitcoin was created by the Bitcoin Foundation" or that the "Bitcoin Foundation decides the roadmap for the Bitcoin project and are responsible for it" etc? Or even that journalists will say such things?
Not to mention the risk of small manipulations. If they really don't even accept anonymous memberships, that already shows they miss some basic principles.
The bitcoin project is de-facto the official standard bearer for the development of the bitcoin network. The Bitcoin Foundation is just formalizing it.
I would prefer if Bitcoin stayed just like E-mail: no "E-mail Foundation", no "E-mail phone number" etc, and everybody understands that very well. Nobody asks for an "authority over E-mail".
HTML5 is determined by a standard group. There's no evil people going around making HTML5 into a tool for government spying.