This is the chart of Bitcoin's Avg. Transaction fee:
https://bitinfocharts.com/comparison/bitcoin-transactionfees.htmlRight now the median fee is about $2. After lots of halvings the reward won't be enough to satisfy the miners. I guess that after a decade, bitcoin will be more widespread, as a result, more transactions will occur every second. Won't this increase the median fee? If it does, bitcoin will start being a not-so medium of exchange. Imagine paying $5 for a transaction. Even paypal doesn't charge that much.
If the demand for bitcoin increases it will exceptionally impact on its expense/fee as well.
It's not a new thing just business rules. If your demand is increasing just increase the product price/lower the quantity.
So I believe the exchange charge of bitcoin going to increase. I won't generally stress over the current exchange cost since we're still paying the lower fee.
It's better to hold your coins more for the future because its demand gonna increase soon.