Random very vague alternate universe idea: what if somehow, before all the various Jewish languages became so endangered, they created an association of language academies?
Now, I don't think it's likely. The various Jewish languages became so endangered due to the Shoah and the exodus of Mizrahi Jews from Muslim countries, around the 1940s. I mean, not all of them, but many dialects of Yiddish were killed in the Shoah, Ladino and Yevanic also suffered a big hit due to it, and Judeo-Arabic is nearly gone now with most of its speakers having moved to Israel or France. Yinglish exists, but I think it's still more of an English dialect than something into itself.
Anyway, I don't know how much research was done into these languages prior to the 1940s, and I doubt they could easily form academies for preserving the language where they were. Plus, unlike the association of Spanish language academies, the various Jewish languages aren't really all of the same family. However, I think they do share some traits, and it'd be cool for that kind of thing to actually establish an international body connecting Jews from around the globe together.












