Even with POS and PoW running in tandem there is a huge technical challenge ahead to get POS to work. I am not at all sure that this change over will go smoothly so I actually think that the coming months are a risky time to have a large exposure to ETH. Software integrations like this rarely (actually never) go smoothly. If you want proof just ask any TSB customer and TSB had an army of "softies" on the case.