To say the truth, I don't see a high risk on BTCs. The coin is going very well since some years ago and won't be now it will "die" or lose all its value. The real risk starts when you try to invest your Bitcoins in unknown sites on the internet. But if you just keep your coins safe on the wallet, no problem, I would say 99% chance of certain safe profit. 
Safety might not be 99% in investments with bitcoin as every coin has two sides, but for sure there is not chance of it to die just like that, it has been around from years now and it would probably not just disappear or drop down its price drastically and if that happens there would probably be a huge reason behind it.