Correct that once all supply of bitcoin has been mined they will only depend to the fees now. Why is it bothering you? Are you a miner? Those miners aren't even bothering themselves for thinking this since they know in the future bitcoin's future will be great and every single satoshi will be worth it as the demand of bitcoin gets higher and higher and what do you think about the fee? They aren't even cheap anymore by that time.
It concerns me. It seems that this has the potential to cause a huge disparity between rich and poor. The rich whales hold the wealth and only they can afford fees. The poor dont hold enough wealth to afford transaction fees.
If affordable technology doesnt arrive fast enough, there will be no new miners, and current miners will be forced to shut down their rigs or lose money. The less rigs online the less decentralization exists. Theoretically, bitcoin could become centralized amongst those who can afford rigs and become a monopoly. I dont think it will happen, but theoretically it could happne, right?