Well,I think it really based on the person who using bitcoins.If someone considering bitcoin as an investment not a means of currncy then he have to sell it when the goal price of him reached.
If someone thinks bitcoin as a future form of currency then he need to hold it forever because crypto currency is going to be the future currency.
exactly this is may always depends on the person on how does he may able to earn and on how they may have the chance to take some opportunity of having this kind of life for , how they may have some chance to earn bitcoin.