Bitcoiners keep their coins in a private key. This has a disadvantage. Let's assume that someone with 1000BTC dies. If he hadn't given the wallet to someone then his bitcoins are lost. So in the distant future that lots of bitcoiners will be dead and they won't have given their private keys to others, many bitcoins will be lost. So the available bitcoins will be lower and lower overtime.

Bitcoin is not like a bank meaning that cannot be used as inheritance. So will it live only on our era? Will it be lost in the future?