It's hard to be predict, or bitcoin will dominate in next time or Ethereum will replace for bitcoin or even there is a new crypto appears... Ethereum is built which the the sever and cloud are altered by "nodes". The number of nodes in Ethereum  has an incredible 5 times when comprares with bitcoin, it shows Ethereum's potential. In my oppinion, Ethereum will overtake Bitcoin in a day, but it's not in  near future.