All scenarios are possible. It could be $1,500 or $150. But ETH provides an ERC20 technology that many other altcoins use. That said, ETH can reach the number ~ $1500. Like XRP, almost a king of altcoin, but the current price of XRP makes many people have to sell the house.
The small contracts Etherium has taken up promises to increase the value of Ether and yes Ether value is expected to reach minimum $1000 by end of 2018. There was a correction in between May and this caused the value stay at the low level. The team said yes the value would go down due to the technical correction taken upon. This has got over and as like other altcoins, ETH remains to the low level. Bitcoin is recovering and other coins as well.