It is far to unsafe to store any real wealth in for the average person.
Exactly, and the all the useless posts that usually accompany such sad events saying the victim should have done this or that, or used this other wallet, or they were foolish for using said wallet, or site, will not change this basic fact. Until a secure wallet can be developed that doesn't take a month of hard core research to figure out all the ins and outs before using, the average Joe will stay away.
Downloading Electrum and installing it doesn't require any hard core research and making offline cold storage wallets with it or with downloaded bitaddress doesn't take any hard core research either, if you're too careless with your money and use online tools to generate addresses or store funds in online wallets than sooner or later you'll get robbed, it's same like keeping your fiat with unknown strangers and expecting that they don't steal it.
Any average Joe who's familiar with Computers and Internet can easily maintain Cold storage wallets for bigger funds and a Hot wallet for day to day expenses, it's not the problem of bitcoin, it's just that people take things too lightly.