What will happen when all bitcoins are issued? In 50 years or more from now, what will happen with bitcoins when all of them are issued? Will mining stop and will there only be a limited amount of bitcoins in circulation?
As far as the stopping of mining, no. Even when all 21 million bitcoins have been created there will still be transaction fees which will be given as rewards to miners. It has yet to be seen if this will lead to a reduction in miners or an increase in transaction fees, or both.