To be fair to us, the Euro is also a world reserve currency, alongside of course the US Dollar, the British Pound, the Japanese Yen, and the Chinese Renminbi. And the Euro is in fact the second largest in terms of external reserves, being only beat by the USD.

Of course, the USD has been for a while the largest one of these, but as you say, they're really trying to get away from that. And a currency falling in relevance isn't new, one can always ask the Pound about that.