Cardano is PoS and has been live for a while now. It's slowly chipping away at Ethereum's use case and with smart contracts coming soon that are backwards comp

Cardano is PoS and has been live for a while now. It's slowly chipping away at Ethereum's use case and with smart contracts coming soon that are backwards compatible with Ethereum solidity code, it will overtake Ethereum over time. There's other PoS blockchains that work and solve the concerns you have outlined.