People who are not believing and not wanted to be part of bitcoin community are people who are close minded and are not technologically dependent. To convince those people to be part of bitcoin community, I think telling them the price of bitcoin is a good factor because it might give them ciriousity. Explaining well about the process on how it works is also a good one to convince people to be a part of bitcoin community. People who are close minded might open their mind and accept bitcoin as a latest technology for making an easy way of transaction.