Ethereum Falls 25% in a day on Coinone, South Korea exchange. How far will this go?

Wow it is 4:00 A.M. in South Korea and on coinone.co.kr a South Korea exchange, Ethereum drops about 25% in a 24 hour period. And 37% over the past 15 days.

The first time bitcoin reached $1,000, it fell below $300 before skyrocketing over $2,700.
Litecoin went from $2 to over $50 and then back to $2
Steemit went 0.50 cents to $4 and then down to 0.15 cents

How far will Ethereum fall to?
Could it be possible for Ethereum to lose 70-80% of its value?