One of the biggest hurdles in my opinion is the influence of the media. There is a tendency to overreact to any form of rise or dip in the markets, and we saw this come into effect just before the most recent major dip. Bitcoin fever took over, and people were investing into something that they knew nothing about. Of course, once a dip then occurs, the same people run around screaming 'bubble', and the media talk about 'crashes'.