This is impossible because etherium is still unable to deal with a surge in transactions so that a lot of transactions are not resolved and failed and this is a logical problem that makes prices weaker and bitcoin seems to remain the leader of all coins for the time being until 2020 still
This is definitely not going to happen forever because there will definitely be an improvement towards positive things. For me Bitcoin and Etherum should be able to work together to build a much larger crypto ecosystem in the world today. Etherum is the biggest platform in handling various projects ICO and Bitcoin is a coin that has gained trust and also a very high level of popularity. So if Bitcoin and Etherum can collaborate well then I am very confident that in the future we will face a very bright digital era.