One of the obstacle of bitcoin are the people who are against on it and think it was a scam. This obstacle cause people for not adopting bitcoin despite of the good opportunity that bitcoin can give. When people really understand bitcoin the volume of bitcoin users will increase and maybe it can be the way for them to earn a good profit.
This problem exists because they don't have an idea about what bitcoin is, because what they hear about bitcoin is the negative thing that is spread by mainstream media. I think the real key is legalization and regulation, I'm sure it will eliminate the negative stigma on bitcoin..