Posting on your local board is not compulsory neither is it necessary. There are a million and one people here that have been here for years and are not posting on their local board but they have been making ways for themselves all these while. Some people I guess do not want to identify with their local board as a result of being anonymous and wanting to maintain their privacy here as a result of the mode of work here.
However, as it is not compulsory that one must identify with their local board, there are some possible other engagements one could be able to benefit from and they have been mentioned already by other members here. Brainstorming of ideas, helping each other to solving problems, talking of their country's involvement in bitcoin and lots more. I think these can be a way forward for the local boards.
I think one of the major reasons why local board was created was for language barrier in communication. People or countries who can not speak or write English since it is the universal language here can easily get involved in bitcoin discussion conversations among themselves with those who knows English to educate and enlighten them more about bitcoin within their local board in their own local language for them to understand properly.