right now ETH are not only drop on USD vallue but also it is drop on BTC too. I will not denied if someone will says it might fall arround $400 but at least it is still stable arround $500 ATM.
Eth should honestly be near BTC's price a lot more than Bitcoin Cash. So I feel as though Eth is at least 20x undervalued, but you won't see that value until all this regulation FUD clears.
IMHO ETH should be near BTC marketcap vallue rather than BTC price because ETH has more circulating coin supply. yes it is still undervallued but for me $1500 - $2000 is a fair price for ETH.