What we need is a system like a base key and derivatives keys that can be revoked / issued via some central government system. If someone's SSN gets compromised

What we need is a system like a base key and derivatives keys that can be revoked / issued via some central government system. If someone's SSN gets compromised, revoke the base key and all keys are invalidated. If a individual organization's use of your key get's compromised, revoke and reissue. Most likely this all will have to happen transparently without the user really knowing what's happening under the hood. Perhaps on the blockchain?!