What specifically could this foundation do if it was malicious that everybody's so worried about? So far all I can see is a superstituous fear of the word "centralization".
For a good start: The name.
The bitcoin foundation. They call themselves THE foundation, but they are not the founders of bitcoin. With the naming and the new public relations function they have selfassigned, they will be catching a lot of newbie attention. Now imagine they focus all the newbies in the premium companies services.
Foundation does not mean being the inventor. Its meaning is closer to the word "organization" or "institution".