Ethereum does not store your public key. It recovers it from every signature you make, then throws it away. The signature is permanent. So the key is permanent. Anyone can pull it back out of anything you have ever sent. Today, or in forty years.

Everything you have ever signed is still sitting on this chain, waiting for a machine nobody has built yet. Privacy that holds only until then is not privacy. It is a delay. ΛΗΘΗ an address that forgets on @ethereum.