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!
Bitcoin is something that we cannot predict on will happen next. We cannot assure if Bitcoin will lasts. But as far as we can see the price is getting higher and higher. The demands is still raising since early thus year and expecting be get more increase until end of this year. So do not be afraid to invest. Bitcoin is too big to fail.
Theres always a possibility and knowing theres no assurance on bitcoin too that it an able to sustain or progress even more on the future years to come on it but if the community support would strengthen even more then we can really expect that it would really last for longer years to come.