If like @labormedia said, Polkadot can be considered unincorporated associations, then there’s no need to wait for Web3 Foundation. Any legal person can act as a “gateway” to a binding contractual framework. This can be easily done that OpenGov pass a referendum signing a power of attorney / mandate to a proxy organization.
PCF is kind of supposed to do this, but to be honest, I expect it to be ineffective because it’s incorporated in the Cayman Islands. We should have multiple (more than tens of them) possible proxy organizations, located around the world, to whom we can sign mandates. For each binding contracts, the mandate should be signed with the proxy organization located closest to the other party (for example, if we sign a marketing service contract with a person in EU, then we should select a proxy organization from EU). This ensures that in case of breach it’ll be easy to sue.
But to be honest, and like I wrote earlier, requiring a structure like this for Polkadot governance to even function is an admission of failure. OpenGov was supposed to do something, and now it just fails back to a traditional organization (unincorporated association) because it doesn’t work.