Perhaps some sort of namecoin or ENS-like petname system with multisig or some type of scripting that enables different recovery methods.

For example, you could set your petname up so it can be controlled by a single keypair, which can be overridden after a certain time by a ring signature based on keypairs held by friends, family, peers, and trusted computing devices you leave in a safe deposit box.

Or maybe you could trust your identity with some centralized entity, but only as part of a 2-of-3 multisig with yourself and another trusted entity.

Basicially namecoin with bitcoin-like scripting controls.