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.
Of course not. With every "halvening" (that is represented as process of producing scarcity), "salary" for mining actually drops 2 times. So, if mining is indeed needed, that means transaction costs will increase 2 times or miners work 2 times cheaper each time. Pick one.