Currently miners get new Bitcoin plus a fee from all the transaction in the mined block. Once all Bitcoin is created, miners will still get the transaction fees

Currently miners get new Bitcoin plus a fee from all the transaction in the mined block. Once all Bitcoin is created, miners will still get the transaction fees. As Bitcoin becomes more popular, the transaction fees alone should be enough to incentives miners. And it is okay of coins are lost forever. If there are fewer Bitcoin available the price goes up. Simple supply and demand. Theoretically Bitcoin can be divided as small as needed to accommodate raising prices.