In principle, Ethereum can overtake Bitcoin not only in 2019,but even this year. But for this we need a combination of factors such as investor behaviour, courses of other cryptocurrencies, etc. At this point in time, this scenario is unlikely.
Hello friend, on what basis do you say the ETH can exceed BTC,
because according to my knowledge, and now I see the price between BTC and ETH is too far, so Ethereum will never surpass bitcoin. The cause of bitcoin is the parent of all coins, even for the coming year BTC will actually become more recognized and remain number 1.