whatever happened to Esperanto?
It was hopeless?
(only funny if you know where the name came from).
The serious answer is that it's not a real language. This means that (a) there are no such things as native speakers, and (b) the whole philosophy of it is that it is perfectly logical and regular, which can only happen if you completely ban anything that amounts to evolution of the language. Real languages - even those with highly structured grammar such as Russian - change with time. My wife always tells me that there's no point me trying to read the original Russian versions of authors like Pushkin or Dostoyevski, because it's old Russian and includes a lot of words that aren't used any longer.
In any case, English has long since become the Esperanto of the real world. Of course, it's nothing like as logical as Esperanto, but it has the advantages that it's widely-spoken, and there are plenty of native speakers to learn from.
Alex