Right now with BTC bear trend, everything is hard to predict what will be the ETH price. Hope 2019 will bring good raise for ethereum and all alt in general.
I think that the real growth of the cryptocurrency market and ETH will begin in 2020. We are waiting for not very easy times in the near future, but we must show resilience.
If it is as you say, then in two years of a fall and a bear market by 2020, we will have prices of the middle of 2017. Not many will withstand such protracted stagnation. Changes are needed by the end of this year or by the beginning of 2019. A lot of people are waiting for this time. If this does not happen then there will be a next collapse of up to $4,000 for BTC.