If someone found out that the system was flawed or if a successor got more traction than bitcoin. But I don't think either of these is likely. (There remains a risk, but: no risk, no fun. 
)
)Why don't you think the latter is likely? All it would take is a more concerted branding effort and a more user-friendly operation and it would wipe this shit out of the water.
Got no real reason for my thinking here.... Ok, I got to admit it is more that I believe it is not likely. (But thats all right, as the question was about "faith", right?)