conlangs1-3  Exercise 3: Did Esperanto Fail?
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  Universal adoption   No. It did not become the world's second language.
  A living community   Yes. It has clubs, meetings, books and online use.
  Learnability         Often reported as much quicker than a natural
                       language, though hard to measure fairly.
  Stability            Yes. The core was fixed in the Fundamento (1905).
  Native speakers      A small number of children grow up speaking it.

A two-sentence answer:

  "Esperanto did not achieve the original dream of universal adoption, but it
  has a stable core and a living community, which is more than most
  constructed languages achieve. Whether it failed depends on whether you test
  it against its founder's biggest hope or against what a constructed language
  can realistically achieve."

Your own wording will differ. Check that your answer uses at least two of the
tests and does not rest on speaker numbers alone, which are rough guesses.