Miners will only make money from transaction fees. Currently, when a miner solves a block, they collect the block reward and the transaction fees for transacti

Miners will only make money from transaction fees. Currently, when a miner solves a block, they collect the block reward and the transaction fees for transactions included in that block. The block reward gets cut in half on a schedule based on the block number. Eventually, the block reward hits zero once it can't be divided any further, so only the transaction fees are the reward. Of course, at some point between now and then, the transaction fees will exceed the block reward, so it'll be moot. By that time, a single Bitcoin will either be worthless, or it will be worth millions.