Now, what if developers decide to increase that hard cap in supply?
I've read similar articles and I am certain that this subject will be up to a lengthy discussion at some point, but for now, we do not need to worry about this. It is actually consensus that will decide as developers alone do not rule Bitcoin. Communication between all entities that constitute the Bitcoin Community will decide. But as said it is a subject that probably won't be discussed for at least another three years and the next halving of miners rewards.