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RE: Languages of the Caucasus - Russian and Soviet Language Policy
Unfortunately, This Russification program wiped out the Yiddish speaking culture of Ashkenazi Jews but had a limited impact on The Mountain Jewish Tat language in the Caucuses. Why? I am not sure.
Perhaps the geographic isolation which would be plausible considering mountainous regions were generally better protection from not just physical invaders but also cultural and social factors.
I think your thesis is quite plausible.