I meet loads of people who have collected coins everywhere. They have 20 different types of wallets with a little bit of value. It's due to happen that people will loose their private keys or forget that they even have an account. Over time that value could accumulate pretty big. What will happen to these 'lost' coins? Will these stay on the Blockchain forever, accessible to no one anymore?
It wont going to anywhere,but it is going to float in the blockchain forever,as long a theres no private keys you wont get the funds from your wallet if you forget or lose your keys,not unless the quantum computer exist and it could break your wallet's keys in just few minutes but if that happens cryptocurrencies are going to be worthless.