Ethereum needs some ajustments but I can see it being worth about 1000$ in 2020
this is a very long way you are predicting. i don't think it takes so long to reach that way. At the end of 2018 we will see its price to reach 2018.
the way people are taking interest in crypto i think it is really predictable that after bitcoin we will see that eth is the only one which is good enough to takes its place in the near future.