Earlier quoted context omitted.
We quite often get firm evidence, and the evidence turns out to be wrong. But I'm a sceptic, which is why I never bought any Bitcoins for $1 in 2012.
I have no idea whether that will happen, just trying to express what I think the rational case is for investing in Bitcoin today. Goldbugs / conspiracy theorists have a line of argument where they describe all the fiat currencies that have ultimately experienced corruption and hyper-inflation. So I think it's fair to say that running a fiat currency successfully for more than 500 years is something that is unpreceden…
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.