It a must to encourage them, let them know what bitcoin is and explain things that they don't know about it. But this is not an easy task.
As a lot of people are still doubtful for it mainly the businessmen and it is really going to be a tough one on encouraging them using bitcoin.
Showing them a proof can help to encourage them but locally they must be bitcoiners that are nearby to his business.
As business that needs to have profit so if there are no bitcoiners near him, his business that accepts bitcoin will be forgotten.