http://en.wikipedia.org/wiki/Nassim_taleb
Just as the TCP/IP based internet architecture was designed to route-around and circumvent any "disruptions" (i.e. an unrestrained US/Soviet nuclear exchange). Bitcoin, as a system, cannot be constrained, every attempt to bring it down or disrupt it, intentional or accidental, will simply act to prove its resilience. Bitcoin is to the transfer of value what TCP/IP is to the transfer of information. It is rapidly becoming a fundamental protocol upon which many new things can be built.
We've already seen significant disruptions with the blockchain fork (unintentional) and the DHS action (intentional) and many smaller events.
Bitcoin is clearly antifragile, at least in the sense that "whatever doesn't kill you makes you stronger".
Brilliant word, antifragile is.