I think holding the bitcoin for a long time is good although its depending on what you of course consider as a long time.
Most of the times a long time can be good its just a matter of time these days to make profit with the bitcoin.
Even I am holding my Bitcoins without selling. I bought it when it value drop and I am going to be selling out when the value increases. This is an usual situations every bitcoiners here are doing the same. Even it has risk, I believe in long run profits from bitcoin.