This sounds very much like the French language policy of civil servants in Canada, where if you have to interact with the public or be considered for a promotion to a certain level in the bureaucracy, you must attain certain varying levels of French fluency based on the nature of your job. Tests, of course, are administered to determine the level of fluency.

In Canada, however, this implementation is taken across the entire country even in areas where there are more Chinese speakers than French speakers (i.e. Toronto, Vancouver). As a result, there’s consideration resentment amongst those living in non-French areas as they view this as an unnecessary restriction to their careers. The gov’t response is to offer free language training to its employees.

Back to Minnan, I think the policy can work much better there as it will be limited to areas where Minnan speakers are of the majority.