It's a good idea not to take a risk and just hold your bitcoins, becuase you will never lose your money if you are attentive enough, i believe on you 
with bitcoin if you hold it it is impossible to lose your money because in a longer run the bitcoin price is going to reach a new all time highSaying that you will hold your coins till the price reaches a new ATH is very different from actually holding till a new ATH. I am quite sure that probably 90% will sell their coins once the price reaches the $800-$900 levels. Only a few people will be able to actually hold out till the price reaches a new ATH.
I totally agree with you on that and i also recommend the same, maybe selling all of them would not be the right thing but selling a half would be better if you get a reasonable price like $800 or above because it may fall again for some time so you should just sell some of them and earn profits and spend them and hold the remaining half it the price goes higher then you can sell them.