We all know that in the early years a lot of bitcoins were lost because they were worth pennies, most people didn't even imagine where this could go, there was no HW and things like that. But even though the bitcoin loss rate has been reduced in the last years I am sure there will still be human errors like the one in the quote that will end up with bitcoin loss, which is not bad for the rest because as Satoshi said they are like a donation.
Understandably when the price of Bitcoin is not so valuable that many cases of bitcoin are lost due to people's ignorance, but it is very disadvantaged if it still happens as it is today. In the past there were some friends who told me and they lost Bitcoin for reasons of mistakes in storage and might be more specific because of losing the key access to the wallet even though the amount was not so big.
But now there are many people who pay attention to the level of security in storing and that is something that is quite considered. The higher price will make people aware of the care of assets so that it is much safer and may not be left alone without taking certain steps.