I don't really think that Etherium will be able to overtake Bitcoin.... Bitcoin is the King of cryptocurrency and bitcoin is the founding pillars of cryptocurrency it had already existed before the cryptocurrency craze and it is still remains. Etherium however had been replaced by ripple in the second place but it was able to take back its position in the second place... so with that being said, Etherium will just remain in the second place or lower but it could never replaced the first place where the Bitcoin stands unchallenged.