"I decided to fact-check myself and I (found) that Bitcoin was actually larger than some national currencies ... We've been moving up the list, if you look at the total value of all the bitcoins in circulation versus the total value of other currencies, we're up to 20 or 40 national currencies that are smaller than Bitcoin. As Bitcoin gets bigger and we move up that list, we're on the path to Bitcoin being a serious world currency." - Gavin Andresen
There are many very small currencies that are controlled by very small countries. I wouldn't say that it would be a very big feat to be larger then these currencies.
What would be a meaningful feat would be to grow enough so that bitcoin is larger then more major economies and currencies.