think about it if you were a miner, and have learnt that you can charge XXX for transaction why would you be happy to again charge just one X?
It is certain the more popular coins will increase costs to catch up with bitcoin, as opposed to bitcoin lowering .
Developers are already being pressured to behave in ways that I dare not repeat.
You made this thread in december 2017, it was the time when the bitcoin price around $19k. No wonder the fee is high too.
If you look at the current fee of bitcoin, it has reduced to a low fee. We can see that the bitcoin fee can going up or down, depends on the price of bitcoin in the market. If you look another coin like ETH, the fee is depend on the network as well.