Despite the fact that every Jehovah's Witness denies it, it is very clear the Faith is American ... and becoming even more so over time. Why, even its doctrines and laws prove this point. Just look at the previous ban on beards, university study and sexual moral attitudes, and see that they all come from a purely American centric view.
For example, it is well understood that the link between beards and the rebellious hippy movement was not that defined out of the US, nor is the reason for tertiary education based on peoples' desire to get rich and make a 'name' for themselves. The United Sates on the other hand, has always had a problem with anti-establishment expression, as it does with its attitude towards money and non-traditional sexual practices.
So we should expect that new Governing Body members will always be American citizens, and any idea a truly international and ethically diverse Faithful slave, will only exist in our dreams.