Currently ETH is on a downward trend. But, maybe 2018 ETH can go to the moon like ever happened before. ETH is altcoin that has many features than other altcoins. So, investing in it not a mistake.
There is a certain limitation when it comes to Ethereum and the important thing is that it cannot be considered as a currency and there are a ton of projects coming out with their platform,but i am yet to see some good projects using their platform in a long time,there are good ones coming but to see the price of Ethereum reach another level of valuation we need more tokens and more usage of ETH gas.