It is very interesting philosophical question 
. No one can say for sure what would be the ETH price even in a few days. And price prediction for long term is million times harder then for short term.
My guess is that after some point, for example when price will be near to $100, we will see a gradual and constant market growth. Of course, there will be local falls and ups, but in general it will be slow but steady growth. And after 10 years the price of ETH could be even $100k.
. No one can say for sure what would be the ETH price even in a few days. And price prediction for long term is million times harder then for short term. My guess is that after some point, for example when price will be near to $100, we will see a gradual and constant market growth. Of course, there will be local falls and ups, but in general it will be slow but steady growth. And after 10 years the price of ETH could be even $100k.