Ethereum is a great use case, if not for anything, the fact that it's the fuel needed to launch on the Ethereum Network. So long as ICOs continue to get launched on the platform, ETH will continue to valid. I just feel the price growth of ETH especially in 2017 wasn't organic enough, it rode the tide BTC enjoyed and so the road to it's ATH will be rough and long, except of course the fundamentals are in it's favour.