Well with my paper wallet analogy, if you lose your private key, someone else will find it as well. But anyway, there are enough divisible Bitcoin units that th

Well with my paper wallet analogy, if you lose your private key, someone else will find it as well. But anyway, there are enough divisible Bitcoin units that this doesn't pose itself as being a huge issue. When the network will be hit hard by large amounts of bitcoins trapped behind lost private keys, I'm sure there will be some implementation changes to the Bitcoin software in order to free up the coins and make them go into circulation (to be mined). For example if an address hasn't been touched for 20 years (death? lost key?).