No. There won't be a time they will make a Star Wars reference book (similar to The Essential Guide to Alien Species reference book published in 2001) that will contain all the info and descriptions of the 20 million sentient species (excluding non-sentient and extra-galactic ones) in the galaxy of every shape, size, color, and unusual feature because it will be at least 30 million pages in length (In addition to the large alien portraits, they get a 1 1/2 page detailed description of the species, their histories, what planet or moon they're from, and what books or movies they're in). Due to the 30 million pages in length, it will be in 12,000 separate reference books (2,500 pages in length per book).
No. There won't be a Star Wars reference book that has all the info and descriptions of 20 million sentient species (because, in addition to the large sentient species portraits, each 1 1/2 page will give a detailed description of the sentient species of every shape, size, color, unusual feature, their histories, and what planet and moon they're from, and it will be 30 million pages in length).
No. The authors, including Daniel Wallace, can't make a Star Wars reference book that has all the info and descriptions of 20 million sentient species in the galaxy, because it will be at least 30 million pages in length (1 1/2 pages for each of their large portraits, their species, their histories and what planet and/or moon they're from).
The Star Wars galaxy is FICTIONAL, as would be any such reference book.
The list of the imaginary Star Wars reference books are: The Essential Guide to Planets and Moons (contains 50 million inhabited systems (incl. planets and moons) and 69 million colonized systems (incl. planets and moons)) The Essential Guide to Sentient Species (contains 20 million sentient species in the Star Wars galaxy) etc.
There are 20 million sentient species in the Star Wars galaxy, so each sentient species (excluding humans) has its own native tongue, so there are 20 million alien languages for each one of them.
There's a 1 1/2 page detailed description for each sentient species, their histories, what planet and moon they're from, and what native language they speak. And there's 20 million of them in the Star Wars galaxy. So there's 30 million pages in the in-universe reference book.
Fiction authors have a free hand for what is in their books. However it is not known how many sentient species there are so the author may decide that also.
You can make 100 billion separate books that has the descriptions of about 10,000 trillion sentient species (100,000 per book) by simply orderly compiling them.
You can't, because it will be impossible to make a mosaic of portraits of the 20 million sentient species in the Star Wars galaxy (including their species names and homeworlds).
It is impossible to make a collage of all 20 million sentient species in the Star Wars galaxy (along with their portraits, species names, and homeworlds).
It will be impossible when they make all 100 billion reference books that has each all of the descriptions and info on 126,000 sentient species (alien races) of all shapes, sizes, colors, unusual features, etc. in each one of the 100 billion galaxies in the observable universe. Also, it will be 189,000 pages long in each one of them. But for now, it is unknown.
Yes. While it might have been stated that there are 20 million sentient species in the Star Wars galaxy, that does not mean than someone came up with 20 million sentient species. It would be impossible for any team to come up with such a list (in alphabetical order and homewords in parenthesis), especially while avoiding trademark infringement.