I see ETH to become next blessing in disguise, I remember when it was around $100 people condemned it not to go anywhere within the space of a month interval ETH shuck the price in 500% increase and today is about $1800 let's watch and see ETH will create unbreakable records, channel some useless coins you have to ETH and relax in future.
Ethereum is one of the most likely favorite altcoin for some long-term investors. They have had great returns on this investment despite the fact that ETH is no better than bitcoin in many ways. You can expect Ethereum to give you great returns in the long term as the price of ETH also fluctuates as the value of bitcoin increases. But if I may suggest you, then don't ignore bitcoin in your investment portfolio although Ethereum is also good for long term investment.
Do diversify if you believe in Ethereum, but you can make up your own mind about what assets you believe can bring you great returns. I could consider Ethereum as one of the assets in my portfolio, but most of the rest will be bitcoin.