Arguably, evry ISP on the planet already is.
Registries are a necessity.
Sorry, that is completely unacceptable. The company that I work for has built a successful business with domain name registration and providing DNS services at its' center. We are not a registry, and have no interest of being one at this time. We do however stand to be deeply affected by any changes that the new organization might make. 230 or so TLD registries in the legacy root.