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.
It will not be east for eth to do that and it will be a long way to go if it really can take the place. But I don't really think it can make it.
I think so because now because Ethereum is the best altcoin after bitcoin and now many people are investing in Bitcoin and Ethereum even though the prices of bitcoin and Ethereum are decreasing but there are still a lot of investments and thus Ethereum might be the next bitcoin generation because Ethereum Growth is good