Ethereum does have a tremendous chance of becoming more than now, maybe the next 1 or 2 years, the price of ethereum will increase considerably from now, but to replace bitcoin, I think it's impossible, because Bitcoin is the benchmark for all crypto currencies there, and Bitcoin I think is more in the know and with a very limited supply
Ethereum is undoubtedly the next crypto after Bitcoin as it placed the second seat since 2015 as it gained popularity due to it's smart contract and transparent blockchain audit and that's why almost new altcoins today were based on Ethereum smart contract blockchain backbone.
Next are Ripple, NEO, LiteCoin and Monero. for me those are few of the most important crypto in this year's crypto market.