If the supply of Bitcoin is fixed and the mining continues to scarce it, the transaction cost of Bitcoin will certainly be higher. But I think that's because of demand. As long as someone continues to chase Bitcoin, the transaction rate will be higher.
Actually, if you look back just last year, the drop in transaction fees are almost comparable to the drop in btc value lol. A lot of aspects can be seen to affect that. First would be the plunge in price, segwit and lightnijg network as well perhaps.
Hopefully in the future, this will be noticed soon, and re-fixed. maybe that happens because every year, the number of bitcoin users is increasing, so the transactions that occur are increasingly uncontrolled, which results in a fairly high and stable fee price.