Ethereum's transition from Proof of Work (PoW) to Proof of Stake (PoS) under Ethereum 2.0 is a significant shift. PoS eliminates the concept of mining in the traditional sense. Instead of miners, there are validators who are chosen to create new blocks based on the number of coins they hold and are willing to "stake" or lock up as collateral. This means that the energy-intensive process of mining will become obsolete for Ethereum. For existing miners, this could mean repurposing their hardware for other cryptocurrencies or considering becoming validators if they hold a significant amount of Ethereum.