MtGox attack - yeah it was bad. But just one attack. And has nothing to do with the design or concept of bitcoin.
Mining difficulty increase - well no shit. Saw that one coming with a glance at the difficulty chart 2 weeks again. It's built into the way bitcoin is made.
Let's see what the value of BTC are in a month's time.
But just one attack?! Btcex.com was attacked earlier in May. Mining pools are permanently doing tiny pilfering, while distributing BTC per workers. Mining is unprofitable at time interval = 3 months! Just 1 month ago.. it was VERY VERY profitable.
In a perfect design,
- any attack is impossible
- exchange-to-trade relations are formalized to work under condition of total distrust
- miners are normalized to be profitable single, without pools, for years
- transactions are designed to pass in soft real time guarantee
- clients are designed to invite a third party to make dealings under condition of total distrust each other
IT IS POSSIBLE, although difficult.