I am. Many systems such as GitHub recommend users to expire a key pair after a specific duration has passed for a security reason. I think that's reasonable to mitigate a risk.

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the only way this would be possible if we have two sets of key

one permanent which control a second key which is changeable.

this would also be beneficial in events where our second key is compromised.

I agree. However, I don't like using key pairs as identifiers, to be honest. I would rather prefer identifying yourself by doing something like keybase.io is doing.