It seems to me not correct that the price of most ERC20 tokens depends on the price of the ether! What do you think?
Most of the tokens are independent in price because many tokens are failed but Ethereum is alive in the market. So few tokens are follow the Ethereum way but Ethereum also depends on Bitcoin do you agree that because if Bitcoin is raise others also move forward and it will fall automatically most of the altcoins are fall including Ethereum.