Why don't the Incubator add new languages
There are so many languages that the community wish were in the Incubator, and so many qualified people willing to contribute. And still duo doesn't add the languages, why?
I think the reason is along those lines. They only add more once there is enough space.
Also, there isn't always enough qualified contributors. If perhaps the reverse course of the language you wanted to learn was still in Beta, I don't think that they'd start the course either.