Ethereum grew up from 7$ in January to 800$ in December last year. It it continues, Ethereum will able to overtake Bitcoin. But I'm afraid this year will not be so significant growth after the last explosion of Ethereum
Overtaking bitcoin is a little bit impossible for me before ETH can overtake bitcoin he needs to pass BCH before he pass bitcoin. Since prices are always slow moving and sometimes they are on the red it is hards for every coin to overtake one another specially whebn the price of a coin is too low and the coin that need to overtaken is too high.