Whether ETH can fall to the price of $ 70 for now or bounce up, seen when btc rises eth does not rise but when the btc drops eth it decreases too, whether it is possible or not
Now the price of ETH stands at $86, nearly the price you predicted at the end of August. And I think at the end of 2018, the price of ETH will continue to decrease, I guess that the rate of ETH will drop to below $50 before recovering in the first of the year 2019.
Probably the price is going to keep going down but I do not see it how it can go that low, but the investors are so afraid about what it is happening that they are still selling their coins even when this is the worst moment to sell, so there is a chance your prediction becomes true.