The last big reorganization was in 1963
when they decided there should be state based division, like Good Sam has. They thought better of it and developed the 4 region (East, Midwest, West,and South structure which quickly evolved into the Region structure and the three level IBT structure we have had ever since. The intermediate Region level was developed to make the communications with the national leaders more "orderly". Region leaders were supposed to help local units.
Things tend to evolve to satisfy the personal needs of those in charge of making the rules. It is not likely we will see a positive change actually implemented by those leaders unless it meets their personal needs. The people now in charge have made it the way they want it. Why would they make any meaningful changes? Grass root changes do not normally work, unless there is a complete breakdown or crisis. Big changes (like the forming of the United States) frequently require a Revolutionary War of succession. Not all succession wars are successful. Think of the US Civil war.