Ethereum is never to its full potential in the past. Ethereum is much more strong than we think. As its shrading and plasma is coming in 2019-2020. will hugely spike its price.
Offcourse holding ethereum is good thing to do, i am sure that all of those people who will hold there ethereum until it's price will became $1000 is very smsrt people, we should not stop holding at this point because ethereum can still rise soon.