Ethereum cannot maneuver bitcoin easily. Bitcoin holds 50% of the market cap and ethereum did not though it was the second largest cryptocurrency. The popularity also of bitcoin than ethereum helps to boost its price.
A lot of speculations I've observed telling that ethereum will dethrone bitcoin but up to now, ethereum is just in the second place.
Yeah,. I heard a news that this 2018 is the year of the eth and other crypto tokens. And yes the price of the eth today is pumping, but i think it can't easily overtake the price of bitcoin because i also observed that once the eth pumps the bitcoin price is also pumps.