There are numerous counterexamples of minority languages that have prospered despite the presence of a majority language that granted economic opportunity. Why

There are numerous counterexamples of minority languages that have prospered despite the presence of a majority language that granted economic opportunity. Why didn't the Finns and Estonians just abandon their languages for Russian, the Hungarians theirs for German, or the Yugoslavians Serbian? If the Occitans had had their own country, e.g., if France had been carved up like Russia or Austria-Hungary had been, I see no reason why their language wouldn't still be commonly spoken.