Statistically speaking the biggest blocker for those who are interested in bitcoin is that there is a lack of investor protections currently I don't have a link but I beleive it was a coindesk article but I could be wrong.
Life in crypto currency is all about money so in order to get people in this system then we must assure them of profit. They will only be interested in crypto currency if they knew that they gonna earn a lot. People wants to achieve something before trying it and giving them earning is what crypto can provide them.