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?
Even if more persons should misplace their private keys, send their bitcoin to wrong addresses or even pass on without reveling their keys to their loved ones, Bitcoin as far as I aam concerned will continue to exist even if only 1 BTC is left in the world. I based my opinion on the fact that Bitcoin comes with 8 decimals. So if only 1 bitcoin is left in the entire world, it will still be enough to be used for p2p transactions and as a store of value .