I dont think so. at all. i am very bullish about this year. but choose your coins wisely. many of them will fail this year, but the good ones will prevail and grow. 
yes, we must be optimistic, because everything starts from our thinking, if we think good, then what will happen is something good. Although we do not know what will happen in the future, but we all hope things will improve this year, and I predict all prices will get better by the end of 2018.