Ethereum's PoS has been running in production for three months, and has about $5 billion staked. So far it's running perfectly. They still have to migrate the

Ethereum's PoS has been running in production for three months, and has about $5 billion staked. So far it's running perfectly. They still have to migrate the rest of the network to it, but that's a relatively easy task. Once you have consensus, adding more data to reach consensus on is basically just adding a hash value to each block.