For long term i will invest on ethereum, i think is the only who can bring some profit and even if market drop ethereum will not drop so much as other altcoins.
Seriously, I guess not. Ethereum like other altcoin too, its price will fall drastically if there is comes a crash. Look at the ATH in 2017, $1400 is the ATH at that time and its price fall below $150 when the crash came. So, it's same with other altcoin because the investor of cryptocurrency has the same perspective when decide to buy, sell and hold.
Yes, anything can happen in the market due to a huge fluctuation in 2018, makes the altcoin prices to decrease their value in the market. Which at one case we have seen the price of ETH has fallen below the price to 90$. So we might see an even higher trend in the current situation in the coming days.