I love the concept of Bitcoin. I believe the Internet will redefine currency as we know it. I hope this helps the Bitcoin community to develop a currency that's really resilient to attacks.
But, is it possible?
If we talk about the coin itself bitcoin, then I do not think that it can be hacked. If we talk about the blocking system, this is also not possible, since all those who work with bitcoin and generally crypto participate in it. So bitcoin is safe in any situation.