The safest way to keep bitcoins to use offline wallet or secured sites that are storing bitcoins. You must use a unique wallet like blockchain wallet that has many confirmation and verification before you can decrypt or open your wallet.Always make sure your private keys are always safe offline
Yeah it can be use as a wallet but I think the best wallet that bitcoin can use is blockchain and we can introduce block chain to the whole world so that bitcoin will rise up in price and will earn money for people every pump. For me now it is not very hard to keep your bitcoin safe as bitcoin has wallet and we should take benefits from it, online and offline both kind of wallets should be use because it is the need of the day to have more than one wallet for bitcoin.