I control the private keys of my blockchain.info hot wallet and i don't have a big part of my bitcoins in this wallet. But i am not sure it is the case of 1.5 million users. I am sure a lot of them are not able to get their bitcoins if the site is down.
Exactly - and even if they did obtain their private keys, how many would find it straightforward to use bitcoin-qt.exe command line API or run the gauntlet with some other wallet app.
Then they should learn before using the tech. Many of the older Bitcoiners here spent ages learning about the tech, often months before buying coins. Now people don't even care about the tech and just jump in thinking they're getting rich quick.
Unfortunately in the beta stage of this project a certain amount of learning is necessary to secure your funds. Just because u cba to learn how to use it properly isn't going to stop your coins from disappearing. Granted companies such as circle will be making it easier as well as insuring your funds and then you can place a calculated trust in a third party