Actually Before I comment on HODL or no HODL, I need to say it depends how you purchased the coin and at what price.
Suppose I purchase something at $100, it means I am confident on my research that its price is $100, if now market start trading at 90$ and my research still says it is good at $100, then I will HOLD. If I now come to some new facts that make me believe that it actual price $80. then I will sell at $90 at once.
This is a really good statement. Today's market opens a very good opportunity for new investors because the dip is too much but we can still see the use of that cryptocurrencies especially bitcoin. But on the other hand, hodlers lose too much money exponentially which is really a pain in the ass. So i do think it is much better to lose a smaller value and invest it in other alt coins instead of hodling it and losing a lot more money.