Is a new found exploit going to kill Bitcoin? Possibly.
Yet, in 2010 somebody was able to find a bug good enough to produce 184 BILLION BITCOINS for themselves. Did Bitcoin die? No, a solution was found and the problem was eventually solved.
This is what I expect will happen to Bitcoin in the event of a Quantum Computer powerful enough to 'kill Bitcoin'. A solution will be found and we will simply move on after a few minutes, hours or days of panic. That is it.
Wow I never knew that! Crazy. I think you're right though because the bitcoin devs are very savvy and the bitcoin community is very savvy and eventually we will just come to a consensus and it will be the solution and move on just like we always have. I also think that what Fuzzy said is so true, who cares about Bitcoin at that point they can take down the biggest financial titans/markets in the world (at least for now ;P). The way Satoshi designed this currency system surely it would be impossible to "kill Bitcoin"