There are 2 first arguments, some say that miners will be forced away from the rewards of the blocks they receive for their work once the supply of Bitcoin has reached 21 million. In this case, these miners may need to rely on transaction costs to maintain their operations. Miners will then find inaccessible processes, leading to miners being depleted, the Bitcoin network concentration process, and many of the negative effects that occur on the Bitcoin system, transaction costs alone will not be enough to keep Bitcoin miners financially dissolved once the mining process is over.
On the other hand, there is reason to believe that transaction costs and mining costs will actually increase in the future. The mining chip will be small and very efficient. This will reduce the burden placed on the miners and allow mining to be activities that have lower initial cost. And transaction costs can increase, so this can help miners to stay afloat.