Would I say what? That it's a "speculative, high-volatility commodity with no use value traded in an unregulated market"? No. Gold has use value and is generally traded in regulated markets.

If something is volatile and great for speculation, it's a bad store of value. So I don't think Bitcoin qualifies as that either.

> the world needs precisely one digital store of value

that's an assumption, not a fact. The existence of an object doesn't automatically prove that the world needs that object's existence.

May be the world _never_ needs such a method, given existing mechanisms already fullfill such a need (e.g., a bank account/credit card).