The way it usually goes, your online identity is your private key. If the key is compromised, there goes your identity. Inkan fixes that.
You keep a master key in cold storage and a signing key for everyday use. If the signing key ever leaks or gets lost, the master revokes it and delegates to a new one. Same identity, same followers, fresh signing key.
If you'd like to take a look at the prototype: 
Log in with your NIP-07 extension and say hi to the test identities already walking around. Or make one of your own.
Inkan
Inkan web client