Nobody will expect what comes next. $1000 is highly likely by the end of the year. $6000 by the end of 2018 would not surprise me. By this time institutional investors will be in. The herd is coming, and when it does, the numbers will make your head spin. Here is a strong signal for you doubters:
https://entethalliance.org/members/6000$ unrealestic point. But definitly good potential there. Reach to 1000$-2000$
I know it sounds crazy, but you have to consider that right now nobody outside a very small circle even knows about Ethereum, but most people have at least heard about Bitcoin..... If Ethereum has just 1 or 2 successful dapps that get the mainstream using it, or simply if institutional investors start coming in (which they will be very soon), then really 6k is not that unrealistic. That would be a 575b marketcap. Gold for comparison is about a 7t marketcap. Most people a year ago would not believe you if you said BTC would be 10k, look at it now...