Everyday people lose access to their wallets, send Bitcoins to wrong addresses. It results in Bitcoins being lost forever. In the meantime, there is no way to prevent it.
So, lets suppose that Bitcoin would exist forever. It means that at some point there wont be any coin left in the network
I know there are other implications/discussions about Bitcoin supply. But Id like to limit this topic to this concern (Bitcoins lost).
Is the 21M BTC supply promise realistic?
Forever is a very long time. No currency has ever lasted forever. If a 2100000000000000 supply of satoshis is not realistic, what do you think a better number might be?