I think Ethereum is the best altcoin to buy in 2018, ETH is still popular and it's value is tight with bitcoin prices, ETH better than long term investment and brings huge profits, and many investors become So rich because of ETH.
About ETH, this is all right. Market failure and fall in the market prices are two very different things and people over here are mixing both for ETH. However that is not the case in reality and just the market for ETH is down so it is a wise step to invest in this very potential coin. Besides, Bitcoin seems very profitable as well in long term because in the long term, the addition to the worth of Bitcoin is manifold than what it is in short term.