English is perhaps the most successful world interlanguage in the history of the world. My point is that, it would still be considered a failure by the standard

English is perhaps the most successful world interlanguage in the history of the world. My point is that, it would still be considered a failure by the standards that Esperanto set for itself. I take that more as an indication that Esperanto's standards are unrealistic more than that Esperanto is a "failure".