Bitcoin just like any other currency, is worth exactly what people think it is worth. The entire financial system is basically a collective delusion of sorts. Any currency can become worthless as faith in it drops out.
Caveat, national currencies are secured with economic power, a system of law, culture, military power, etc etc. It is a bit different. They aren't perfect either but there is more supporting what people "think" they are worth here. Bitcoin has it own culture and history, but it is still a baby. I do think bitcoin is a bit more like Gold, although Gold has real uses so that is still a bit of a rough comparison.
I think if anything all that give me less faith overall than something maintained by people who operate a currency for the love of it.
The value of my past work being tied to the success of something I have no control over, a machine that murders innocent people in drone strikes across the world?
That's not something I want to have faith in.