When there is a solution for a wallet that easy to use/maintain and hard to steal from.
For now I can not recommend any of my friends to save/use bitcoin, because showing them how to secure a wallet and use them properly is a "mission impossible" for non technical users.
If they can't be trusted to look after a Bitcoin wallet then they shouldn't be trusted to do online banking. A blockchain.info wallet is fairly simple and easy to use and is very safe as long as you set up all the security features. I recommend starting with it for newbs.
There is so much it can happen if you own a computer and have internet connection that the best advise is to not navigate the internet at all if you're so lazy not to take few diligent steps, but yes if they have a smartphone with the blockchain app their wallet will be pretty secure.