Each month we put a lower target for ETH. Because we realize that ETH is very difficult to go up in 2018. May target 15000$ but now target 500$ for ETH at the end of the year. To reach 15,000$ then we need to wait 3-5 years if the crypto continues to grow or if the market continues to saturate, then we need to wait a lot longer
Nobody will give you the right answer to this question. the cryptocurrencies prices are always unpredictable. It will be not really very easy to give such a forecast now.