There is already a PoS chain. After the ice age in June/July, there will be another PoW chain as well. It will be up to individuals and exchanges to decide whic

There is already a PoS chain. After the ice age in June/July, there will be another PoW chain as well. It will be up to individuals and exchanges to decide which one they want to do transactions on. And they might even choose "both", as in the case of Ethereum and Ethereum Classic.