for the end of 2018 it doesn't seem like, I see ethereum this year trying to get back to $ 200 is very difficult and I think they will be able to do it next year
Right, most probably around $100-$120 would be the price ETH will reach before the end of the year. But don't be discouraged though, its still a perfect buying opportunity. Just imagine buying just 1 ETH today and then let it grow to x10 (its previous all-time-high), then that's a lot of profits.
Might takes years though but I'm sure it's worth a gamble at this point because we all know that ETH has still a bright future ahead.
In any case, we will see that Progress does not stand still and technologies change and old projects are updated every year. But we always get an improved product, Proceeding from this, I doubt that it will take many years to improve the cryptocurrency market.