So very true if you have to peg that 400mm to a specific exchange rate for another currency.
You can ascertain the value of 1 BTC in your favored currency rather easily given a choice of marketplaces. Less so with 100, or 10000+. Most market-places couldn't handle the volume without a substantial shift in price before your 400mm mark was hit for say, USD.
That said BTC seems to want to reach the type of ubiquity that allowed USD to be a universal currency of sorts during it's heyday. With means to convert in and out being varied from the strictly regulated to the strictly unregulated.
You can ascertain the value of 1 BTC in your favored currency rather easily given a choice of marketplaces. Less so with 100, or 10000+. Most market-places couldn't handle the volume without a substantial shift in price before your 400mm mark was hit for say, USD.
That said BTC seems to want to reach the type of ubiquity that allowed USD to be a universal currency of sorts during it's heyday. With means to convert in and out being varied from the strictly regulated to the strictly unregulated.
Now let's see how long the blockchain can live.