Even with a fixed qty; uncovered exploits, technological breakthroughs, change in crypto trends (aka a move to another platform), or change in society could halt an increase of value.
Technically the same is true of gold. Even with out a massive change in qty, something as simple as a better gold like alloy for jewelry, an alternative for electronics, or a sudden cultural aversion to gold ownership could reduce the value.
I think neural nets and deep learning systems are misunderstood so profoundly because humans are bad at many kinds of reasoning and the explanation of the neural net being "smart" is so psychologically appealing.