The economic reach of Bitcoin is an interesting subject of discussion. In the end there will be a maximum of 21.000.000 BTC. BTC is a eight-digit number.
I suppose that a currency can only be leading if it has the possibility ta pay in small amounts, equivalent tot e.g. dollarcent or eurocent. This statement limits the range of BTC, will the satoshi be the future euro/dollarcent?
In that case the maximum money supply wil be BTC 21.000.000,00000000 is e.g. EUR 99.999.999.999.999,99 (by the way: interesting exchange rate).
The money supply in the Eurozone (M3) is over EUR 10.000.000.000.000
So without any constraints, the structure of the BTC satisfies the necessary condition.
Let's inventory the other constraints.
I believed that bitcoin can be the leading currency because only bitcoin has the highest price than ever i know currency. Even bitcoin can experience a falling down to its price but its still higher because i bitcoin is higher because no one currencies of the nation can be leveled by bitcoin price because it is too much high . So that i believed and i surely assure that bitcoin can be able to become a leading currency through all over the world.