The transaction fee is a reward to miners as I was told. This means it will not be regulated. As Bitcoin adoption increases with time, so also the transaction fee. Especially when it becomes difficult to mine a block and get it's reward. How about when there will be no block to be mined again. It's hi time we understood that bitcoin transaction fee will keep going high as Bitcoin adoption increases in as much as it still uses PoW design.
That is why Lightening Network and the use of Segwit (Segregated Witness) addresses should be encouraged in order to battle the BTC high transaction fee.