You could also point out the millions of satoshi's leftovers in exchanges and forgotten addresses.
Any money in dead/abandoned/forgotten about exchange accounts is not lost and will eventually re-enter circulation. The coins deposited to exchange accounts have already been swept in to the exchange's central wallets and are still accessible by the exchange in question. All exchanges will eventually close inactive accounts, whether after 1 year, 5 years, 10 years, whatever, and any balance left over in those accounts will simply be erased, with the exchange claiming any coins for themselves.
Forgotten addresses are another thing, and if the address has never been spent from and the public key is unknown, then these coins are unlikely to ever re-enter circulation. However, it is impossible to ascertain for sure how many coins are actually in forgotten addresses, as even addresses which have been dormant for 10+ years have then woken up and sent coins, and it is impossible to prove an address has been forgotten. Even if the owner claims the private keys are lost forever, there is no way for anyone to verify that claim.