Considering a bitcoin owner of large amount, and he died w/o sharing his user/pw, Are those coins can be considered as deadcoin since those coins will not circulate anymore in the Network?
In my own understanding, if someone lost his private key or if a owner of a bitcoin dies without leaving his private key to someone, the coins that he have will be in limbo or just in the wallet. This may result also in the decrease of bitcoin in the market and it may even pump up the price considering the decline of supply. So better to have your family members know your private so that if anything happens to you someone can take over of your property.