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.
Ofcourse ethereum. As we all can see ethereums volume is next into bitcoins volume so we can really say that it is the second highly in demand in terms of holding or buying tokens. It also means that it has high price because the higher the volume and the demand the higher the price of that token also.