>> -Someone break the encryption / somehow the system doesn't work the way everyone thought and fails entirely
Bitcoin algorithms can be changed. If needed, the core developers can hard fork the block chain. Is that a problem any more?
This is one I just haven't researched enough. I have no idea what's possible, it's just in the back of my mind since I don't fully understand yet how it works. With that said, it's concerning the the "core developers" can still have an input. I was under the impression that once a crypto was put into place, it just ran it's own course with no input.