There have been speculations that Ethereum will become the coin of the year in 2018 but this seems far fetched. Bitcoin is still strong and sustaining. Sure Ethereum might come close to where bitcoin is right now but it still has a long way to go to become coin of the year. Moreover, there are still countries that are struggling with accepting crypto currencies. So when the time comes that they do, bitcoin will most likely be their first choice. Either that or they'll create their own crypto. Not saying there's no future for Ethereum. It'll still be in the game but won't be as strong as bitcoin.