One avenue of thought I have - what if major financial firms decided bitcoin was the way to go? So rather than use US$ as a reserve currency, they go for bitcoin. The gold rush would be matched by fundamental strength.
I’ve always been fascinated by currencies - as soon as you start transferring bits of paper representing the underlying goods / services, you get lots of weird effects. Like people actually believe the currency they hold is valuable - which, in a worst case scenario (say, zombies) - is patently untrue.
Bitcoin raises this other dimension - its value is nowhere, not tied to anything.