Of course. Evidently, Bitcoin price is always unpredictable, but we can easily recognize that although the price is fluctuating, Bitcoin charts have shown that through many years, Bitcoin price always goes up. So if you decide to hold your bitcoin in a long period of time, you can earn some profit with it
Price will definitely rise in long term so I don't see any risk in holding them for a long period of time, and its good to keep them safe in wallet instead of investing it anywhere and welcoming the risk of loosing them as investing them anywhere is a big risk at a moment and certainly it will decrease the level of our coins.