for me personally, ethereum is not possible to overtake bitcoin,
Bitcoin and Ethereum are designed for a different scope of activities, and they are the best, at this time, against them. And my opinion is that they will live all the time there are crypto currencies and nothing will put them forward from the front line, because Bitcoin is the beginning of the history of digital money in cryptography, it is the Foundation for all crypto-currencies that are and what that will happen, but Ethereum has provided new developments