People are never going to be using ETH as a currency. They would use stablecoins like DAI pegged to USD or a basket of assets. A high price of ETH as an asset

People are never going to be using ETH as a currency. They would use stablecoins like DAI pegged to USD or a basket of assets. A high price of ETH as an asset creates a higher security level for Ethereum the blockchain. The ecosystem of projects, apps, protocols, organizations, etc on Ethereum is healthier when the blockchain is guaranteed secure and stable for everyone to use.