Of course, that will not happen, the Bitcoins lost due to losing the private key will be lost forever. There is no compensation for that Bitcoin, because from the beginning Bitcoin was created in such a certain quantity and no one, not even Satoshi, can fix it. Because of this, Bitcoin has value, and the actual number of Bitcoins that can circulate on the market will be much lower than 21 million. This is an advantage for those who are holding Bitcoin, because I believe the price of Bitcoin will grow many times more than its current price.