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..
These days a lot of people will just keep on judging you and unless you have a proof.
If a lot of people are using Bitcoin, I guess this will not be a problem. We are using Bitcoin for a long time now and I don't see any problem or "scam" into it. The only scam I've experienced is investing on ICO or projects that I've not studied carefully or thoroughly. If they will just read or track the history of Bitcoin, I think they will understand that scammers just use the anonymity of it and Bitcoin is not a scam itself.