I have heard a thousand times that many bitcoins are lost due to the owners either forget their private keys, lost the hard drive, or simply die before they tell their family about the wealth. Although 21 million sounds like a lot, but with accidents like those keep happening, it's sooner or later bitcoin will gradually...be depleted. I know now the reward for miners are new issued bitcoins plus transaction fees, could it be possible that some day the reward includes a new feature, that all wallets will give a small portion of its balance to the miners, either a small percentage of the balance, or just a few Satoshis per wallet. So that "dead" bitcoins will slowly become global wealth for all humans again over a great span of time? What do you think? Is it a very stupid idea?
I don't think this is a good idea and the people also don't want this.But lost bitcoins can be helpful for the greater demand so the value of the total bitcoins will be same even if we found out the lost bitcoins.So it is better to go as it is and here after people have to be very careful with their private keys to safe our bitcoins.