For languages under revitalization efforts, if you look at example from revival of Hebrew, people start using Hebrew for daily conversation since year 1880s, and Tel Aviv established in 1909 as a Hebrew-speaking city, however it's only during Mandate period which start after WWI that people start teaching children with Hebrew as their mother language and thus to let them become a native speaker of the language So even in this idealistic Hebrew revitalization case, it would still take almost half a century before Wikipedia could create a Hebrew version for them if we already have Wikipedia back then and this guideline was used. I don't think it's a good idea to drag out so long.