I have 3 ETH now , do when ETH updated to 2.0 , i will lose my 3 ETH ?
Why do you think you will lose all that money? If ETH were to be updated to ETH 2.0, your money would definitely be converted, and you would never lose it
I understand what OP is thinking, probably eth will choose another blockchain and reduce max supply, that's OP thought but it's never going to happen, Ethereum owns tokens kingdom and ERC20 smart contract is here to stay