This is cute. Not even Chargify or Recurly support[1] the "standard" (as far as I know), and they have vaults! Show me a list of other gateways that support the standard, and then maybe you can get the big boys on board.

I used to work in politics. This is the sort of poke-the-giant thing that longshot candidates do, and it actually ends up reflecting more negatively on Braintree than anyone else. It's a tone-deaf PR move from a great company.

EDIT: Looks like Chargify sends the CC details to the gateway and they don't have their own vault: http://chargify.com/features/pci-compliant-security/