If you're worried about someone hacking your wallet, the underlying cryptography for Bitcoin has been studied in detail, and is believed by experts to be secure. Assuming that you choose a strong password for your wallet, your Bitcoins should be safe from theft.

I also am fairly confident that some type of cryptocurrency will become widely used in the future, since it offers unique and useful features. But there is the possibility that some other currency will be developed that is superior.

Also, in the short term, Bitcoin is very volatile. So if you're looking for a safe investment, you're probably better off sticking to more conventional options.