For short term at least there won't be any professions that will disappear right away. I think in the long run it won't greatly affect jobs but it will lessen the market for them, making it not that profitable as a job. I am sure that when the time comes when blockchain is completely mainstream, the one that will be greatly affected are money sending service employees like those who work in remittance center. They might begin to disappear unless they will be the one to use this tech for their business in order for their employees to continue their job.