Ethereum has been moving to PoS soon for a couple years.
It's still the intent, but PoS is effectively still unsolved. It's not just "can it decide blocks", it needs to have the right balance of incentives to be self-sustaining, or it destroys itself.
What makes you say that PoS is "unsolved " ? Did you hear about Cosmos for example ? Their mainnet is running for more than one year without any issue.
It's still the intent, but PoS is effectively still unsolved. It's not just "can it decide blocks", it needs to have the right balance of incentives to be self-sustaining, or it destroys itself.