Yes it does. We should not take it lightly and forget about him. We do not want this hapenning over and over. We want to know who it is, how he did it and why. So in the future it can be prevented. I also think Vitalik would love to know. So yes again it will really matter to him. 
Of course it will happen again, over and over. It is in the nature of the concept of smart contract. He's just the pioneer.
What you are essentially saying, is that future smart contracts will have code that coincides with intend in all possible border cases. In other words, future smart contracts will not contain bugs or exploits. Now that's good news: you know how to write complex code that matches perfectly with intend (doesn't contain bugs) right off from the start. I think that many software companies will hire you !