I would rephrase your point as follows.

Bitcoin is a store of value, but people have just started to realise it.
Its value will hugely appreciate over time, as more and more people realise it's a store of value.

Regarding gold, it's more of a social consensus, leaving aside gold's characteristics that make it fit the money definition.

The diamond history is even more interesting.
It was a useless thing until about 1-2 centuries ago.
Brain washing (a.k.a. marketing) transformed it in what it is today.