I think it depends on bitcoin destiny. If bitcoin hard fork will success then ethereum will lost his price a lot. Because now ethereum price grows up so fast because of fear before bitcoin hard fork of some investors. My price is between 1,500-3,000$. When bitcoin price should be not less then 10,000$. I am very optimistic 
Some says bitcoin prices might goes up to 100.000 dollars. So are you sure that you're optimistic?
In 5 years, we'll be talking about the year, 2022, where bitcoin block halving will have taken place 2 years ago. We'll observe huge price movements.
hahah
I heard that bitcoin will costs even 1,000,000$ in some years. Well, hope I was not optimistic...