Doinmypart
While having a outward focused social ministry (like soup kitchens and other real charitable works) would clearly revalue Jehovah's Witnesses in the eyes of the wider community. Its unlikely in the near term (say within the next 10 years) to have the number of young people needed to do this work in a meaningful way. Because as we are well aware, we are an old peoples' religion.
Thus the ability to implement this suggestion is just not possible and it will take a whole new generation of Witnesses (ones regrown or acquired in some other way) for it to be attempted.
Its not to say that it isn't a good idea, but like some many of the Organization's other issues, due to the single bloody mindedness of the Governing Body's sole focus on the door-to-door work, it sort of idea is now far too late. Even to current push to rebrand Watchtower construction projects as an exciting career option to our youth (as banged on quite regularly by our video updates) doesn't seem to be working, judging by the continual effort the GB spends on these advertisements.
But deep down, the core problem is that now after years of deliberate molding, Jehovah's Witnesses are selfish dependent children, not thinking Christians who look for ways to express their personal appreciation for God's kindnesses. And quite frankly, cultivating the real veneration Christ's qualities and the desire to obtain a mature conscience, is a much harder problem for the Governing Body, than dealing with a failed prophecy. No, not until they abandon King David as a roll model and start preaching the New Testament, will they see any change.