Embed account addresses directly into Smart Contracts

In certain situations, it might be logical to embed account addresses directly into Smart Contracts. I’m curious about the fate of such accounts if the associated identity becomes invalid. What alternatives exist for ensuring a smart contract with an embedded address continues to function after the identity lapses or is replaced with new identity?

An “account” cannot expire. When an identity expires it means that no new accounts can be created from it, but existing accounts function as they did.

Thank you for clarifying that.