Having the public sector running this complex IT organization over this long has yielded a very significant pool of talent that resides as government employees. That talent pool is probably not readily available to a lot of small and medium companies if you look around today, so that talent pool needs to be harnessed. You are changing all right, but there is a talent pool, so there is a significant skill set within the public sector that can be reused, and must be reused, and it's valuable.
In this case, the private sector skill set you would bring in more often than any other would embark on a transformation plan and break it up into projects. You would have to look at how to measure those, how to know they were successful, and how to track them, so it would be almost like running a company. For that part you would probably need to look to some experience from the private sector.