it will be a major step towards bringing the entire crypto field up to new standards. The implications will be huge, I even think that this might be the time when the flipping will happen (when ETH will surpass BTC in market capitalization), it's inevitable and will sooner or later happen, the question is when. PoS will definitely have a huge effect on the price and fact is that more and more people will want to buy ETH in the future in order to be able to stack their coins and confirm transactions, once they can do that they can earn passive income which is quite sweet (depending on your stake). ETH change to PoS will be one of the most amazing things witnesses in the blockchain sector, mark my words, ETH will be number one at some point.