Bait & switch much? Try what one more time? He's laying out a scenario where two different communities has different ideas at what constitutes the valid chain. In no way does this achieve your stated scenario whereby Coinbase and perhaps Bitpay are enough to totally overturn consensus.
But there aren't two communities? What he's laying out is a scheme whereby one group plans to subvert the wishes/desires of another group.
He even went further by stating that, "if the Chinese don't like it, they should make their own Altcoin."
What a guy!