Nah man, "too big to fail" means a central agency is willing to bail out a failing entity. No such central agency exists for Bitcoin. It's the free market at its finest!
We should all be prepared for failure. But realistically the only thing that keeps bitcoin going is the fact that a community of people believe it has value. This same theory, reality applies to all currencies and things of value. As soon as people agree that it doesn't have value it will fail and that will be it!
I agree, we should always be prepared with the failure or fall of the bitcon. But I'm sure there will be a sign before it actually happens. Because there is nothing impossible in this technology. The same thing happen for big companies like yahoo and nokia. The company is practically a giant in its field, but what happens? They can't keep up with the rapid development of the times.