Esperanto is not a language of Poland
Being created by the polish oculist L. Zamenhof does not make Esperanto "a language of Poland" as it is classified in Ethnologue. Although Zamenhof was born in Bialystock, (today's Poland), he spent much of his life in Russia and other countries. Today's Esperanto speakers (mostly L2, estimated to be a few million) are scattered all over the world, with the largest concentrations in Western and Eastern Europe, Eastern Asia (mainly China, Korea Vietnam and Japan) and South America (mostly Brazil). Native (L1) speakers of Esperanto (estimated to be a few thousands) are similarly scattered. As a coordinator of the UEA-commission of Esperanto-speaking families http://uea.org/rondo_familia/ I saw the shipping list of it's bulletin, which in the early 2000's had a few hundred addresses all over the world.
A green language deserving a blue dot
According to the definition of your classification system, Esperanto is more "Blue = Developing (EGIDS 5) — The language is in vigorous use, with literature in a standardized form being used by some though this is not yet widespread or sustainable". Specially for the next step, green, meaning "the language is unstandardized". Esperanto is stardandized from the beginning and since then its literature is very well developed. The fact of lesser population as L1 does not represent its weakness, but the opposite - the language strength made it even L1 for some, although it was not originally conceived for that role. Ethnologue should not use the same parameters for a language category (constructed languages) not like the other ones.
You can't just count L1 speakers for Esperanto
The vitality of Esperanto in Ethnologue is evaluated through the number of L1 speakers, but in the case of Esperanto the use of the language within the family cannot be a reliable parameter to assess the vitality of the language, because of its peculiar sociolinguistic profile. The most influent scholars studying the so-called L1 Esperanto speakers, such as Jouko Lindstedt, Renato Corsetti or Cyril Brosch, agree that L1 speakers do not set the norm of the language in the community of practice. Esperanto is not an endangered language in any sense.
I think Esperanto is not dying as your report seems to suggest. On the contrary, in fact, with the expanding use of the Internet, the use of the language and the number of its speakers have grown considerably.
Last year there was here the information of 2 million speakers of Esperanto in 115 countries http://web.archive.org/web/20150109121524/http://www.ethnologue.com/lang... This information is gone, and the language is classified as a red dot (dying). I think this new information is not true. I send you a video of a debate in a Esperanto congress with 200 participants (only for residents of the province Sao Paulo) https://youtu.be/WfhbUFBqT-o As you can see the language is not dying,.