No new bitcoins will be added after total Bitcoin coin mining which was designed by its creator Satoshi Nakamoto since the invention of Bitcoin. Currently a miner receives BTC and transaction fees as block reward. When all bitcoins are mined the miners will receive the transaction fee as their reward. But it's still a long time before all bitcoins are mined. It is estimated that more than 1 century is needed to mine all the Bitcoins.

In 2140 all Bitcoin mining will probably end. If miners can make profit then they must continue their activities. So it is pointless to think that Bitcoin will crash. As long as there is demand for Bitcoin, there will be value for Bitcoin. Bitcoin will have no value when demand runs out. As people grow, everyone will try to keep a very small amount of Bitcoin under their control. The value of Bitcoin today will multiply its demand in the next 1 decade so there is no chance of Bitcoin being destroyed or lost.