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.
You called them lost coin, then why returning them?
If these Bitcoins should be returned, then it is not a decentralized system again.
Who is returning the coins?
The main problem here is that people that people that lost the coin had already lost it forever, if they are sending Bitcoin back, which wallets are they sending to, is the sending address or the receiving address?
The idea of not returning lost Bitcoins is good and has save a lot.
And mind you, any one that claim to recover lost Bitcoins to you is a scammer.