All the best to them :-) I think having models in nations that actually use a language as their native tongue is far better than choosing a language for which there is no living model (such as Latin or Esperanto).
But then, why don't you also add Britain, Australia, Canada or South Africa to your list?
edit: I personally think Esperanto would be a good choice as an International Language. I believe it's much easier to learn than English.
Moreover, it is well known to sociolinguists that political and economic power is something that makes a language spoken by that nation more prestigious and more desirable to attain, and, therefore, contributes to the spread of that language. So, for the purposes of my dream, I can only wish that the US remains as influential as it is (and doesn't switch to Spanish in the process) :-)
I guess my point is that I am not sure that, say, having other countries where English is the primary language (as listed in the previous comment) contributes to the power of the US. Likewise, I am not sure that the further spread of English as an international language will by itself contribute significantly to the power of the US.
> I personally think Esperanto would be a good choice as an International Language
Ugh, not a fan. English is a vibrant, living language that already is being used by huge swathes of people for various purposes; Esperanto is not.