In my experience, I have over 40 years of involvement with community volunteering, the only true barrier to anyone volunteering their time and talents is their own sense of willingness to give.
Don't get your comment about concentrating power in America.. I'm not in America nor are some others who are currently involved. The legal entity based in America is not a barrier to anyone else internationally to become involved. I'm also not a whale, nor are others involved.
Yes, the voting will likely involve some form of stake based voting. This is a stake based platform, that's a fact of life. The exact form of that voting will be sorted out after the community speaks on which proposal will be the base for the future structure.