I think it will not happen. ETH will never drop 30$. Personally, I believe it will never happen. But I can say, the price of ETH will decreasing more during this year. Some people say the ETH price will drop 100$. Yes, maybe it will be happening because the current price is very near to 100$. But I never think it will drop to 30$. I hope, ETH will be growth fast in 2019.