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.
You have it backward man, as I am typing this post, some developers are already giving us the best of lightning network to be launched. If the lightning network is fully developed, we will see some acceleration in the BTC transaction and the payment will be drastically decreased. it is not the way you think of it. after a few years from now, we will see a major difference both in transactions fees and the transaction speed if they fully initialized and successfully fixed all the current bugs of this technology.