Bitcoin has a finite supply. It is one of the cryptocurrency's characteristics that proponents like. Estimates suggest that all 21 million bitcoin will be mined around the year 2140. CNBC's Tom Chitty and Arjun Kharpal discuss what major changes might take place with bitcoin in that time.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.