Let's look at Mt. Gox. If Bitcoin goes to zero how well-off will they be? They achieve large profits through the Bitcoin market and now they have nothing but incentive to make sure Bitcoin succeeds. I am sure there are at least one or more entities that are highly dependent on Bitcoins for success. The more of these that are achieved, the more they will put money and effort towards building bitcoin and the stronger it will grow.
It is this effect that assures me even more that Bitcoin has a bright future ahead. It can get knocked down but it will get up again with ease.http://www.youtube.com/watch?v=2H5uWRjFsGc