OP the only thing that can be done about those lost Bitcoin is them being found (if possible). Nothing more.
Lost coins only make everyone else's coins worth slightly more. Think of it as a donation to everyone.
Reading the main topic that led to this response from Satoshi, I see the OP talking about the coins of users who were trying bitcoin out but never use it again. That’s crazy to think of. Imagine how many Bitcoin they may have lost just to test Bitcoin. Now 1 Bitcoin is worth $51,000! Who would have known?!
Could have been used for trading.