The inflation one is the only one that's really fundamental to the currently. Part of the core of the Bitcoin system is that the validity of everything that happens is proven by being accepted by all of the nodes that make up the system, rather then by some special authority figure. There are authority figures that publish the node software, but they can't force anybody to go along with any change they make. They have to tell the world what their changes do, and hope that everybody is willing to upgrade.<p>Part of the rules of the system that are enforced is how new coins come into existence, and the current rule for that is the fixed reward per block mined, with logarithmic decrease in reward amount. It is possible to change that, but the fundamental nature of the system is that the coin creation has to be controlled by an algorithm shared and repeatable among all nodes, and so cannot ever be based on any arbitrary or external factors.<p>Even making a change that remains within those limits is risky. To keep the currency in existence, there must be broad agreement among all of the people running nodes as to what the rules of the currency are. If the core developers decide to make a change in that, and 20% of nodes refuse to upgrade, it would be a disaster. And so they aren't likely to risk doing anything that might piss off a significant fraction of the users.<p>So love it or hate it, the fixed inflation system isn't going anywhere.