Expanding volunteer activities could significantly shift how JWs are perceived by the wider community. It might also alter the internal culture, offering members new ways to fulfill their spiritual and social needs.
I think that is a brilliant idea!
Remember, it needs to be the giving of time/labor. They will never give up any of their potential CA$H contributions to others. God Needs Your Money! But they could organize volunteers to clean parks, highway litter, assist elderly (esp JW elderly). They might even find a way to get compensated for assisting elderly/infirm members or non-members. (At least here in the US.)