I just want to reply even though this is an old post. Based on your expectation, ethereium could surpass bitcoin by summer 2018. Well, the first quarter of the year is almost over and the eth price is still way more behind of bitcoin. It is actually more than a hundred percent lagging for the bitcoin price and I assume that even the end of the year, eth price can't step even half of the price of bitcoin. Nevertheless, it is still a good sign that eth price is continually increasing as the time goes by.