Personally, I believe the policy change that occurred in the year 2000 was a direct result of pressure from AJWRB.
Briefly, Jehovah's Witnesses did not have true autonomy because the parent organization was stepping in via the HLC and making rulings on the acceptablility of cutting edge preparations and procedures on an individual, case by case basis. Prior to the year 2000, there had been a long history of this. Most of these rulings established 'precedents' and eventually found their way into JW publications as official church policy, although not all did.
However that procedure was not only ethically flawed, it left the parent organization legally vulnerable. AJWRB pointed this out and articles were submitted to major medical journals.
The policy change in the year 2000 established guidelines that would enable individual JW's to make their own decisions on the acceptability of new treatments without writing or calling the parent organization. As an unavoidable consequence, this policy change broadened the scope of acceptable treatments. That is something that can be quantified.
Another consequence is a huge relaxation in judicial attention and subsequent declarations of disassociation for individual JW's. This is harder to quantify, but I believe Randy and Shaun on this