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.
Bitcoin is a decentralised crypto currency and there is no such proper authentic regulating body over the bitcoin who could keep eye over all the bitcoin activities and thus there is no regulating of the bitcoin activities and thus bitcoin has been use in many illegal activities like in selling drugs, explosives, money laundering etc and efforts are being made to centralised the bitcoin, though no doubt that the bitcoin transaction fee will further increase as government will impose more taxes on bitcoin transactions but it will stop the illegal use of bitcoin.