To me reform would mean getting rid of everything that was wrong or didn't make sense. If they admitted that Christ didn't return in 1914 then select them in 1919 and that the old men in Brooklyn weren't chosen by God and didn't know what the hell they were talking about not much would be left.
They would also have to remove the door to to door work delivering of the faulty message and admit that it was a complete waste of time emphasize by the fact jdubs who have been there a while spend most of there time in field service figuring out ways to count time without actually having to speak to anyone.