Yo,
So apparently there's like 4-6 million bitcoin that are lost and gone? Just curious if there was any ideas or plans to update the protocol to replace the lost bitcoins if there was a consensus, if that is even possible.
When a bitcoin is lost there is no other option but to forget it. Because as long as the Bitcoin is in your wallet and as long as you have access to that wallet, you own the Bitcoin. once that bitcoin is gone from your wallet or you lose the key of the wallet you will never get that bitcoin back and if it is not under someone else then the bitcoin is completely lost and no one can use it. And there is no way to bring them back. this is why Satoshi made such a comment
Lost coins only make everyone else's coins worth slightly more. Think of it as a donation to everyone.