No one is stealing the coins, just marking them as unspendable after they have not been spent 10 years from now (so, some really old coins not moved in 20 years). It was just a suggestion and I have no problem with no one doing anything about them as the coins are unlikely to be spent at all if no one has moved them in the past 10, 11, or 12 years.
Actually, quite the opposite. Everyone's stealing the coins as they become slightly richer due to this feature. They become richer due to the user's inability to spend their funds.
The longest time frame I've seen for fiat banks is 15 years of inactivity, they then mark those as dormant and can "escheat" the money to the state or central bank or whatever. There are procedures for claiming that money.
I think that you should think of Bitcoin as cash; it has been told hundreds of times. What would happen if you left your cash or gold buried in the ground for over two decades? Would you be unable of spending them?
I think that you're trying to find a solution to a problem (Satoshi's rewarded addresses whose public key is exposed) and you introduce others by doing so. Of course, consensus is required to enable this. What I'm telling you is that the users will never come in an agreement for it.