I've expressed other doctrinal changes, but the one this time is the dominant belief that Mormons belief that once a President of the Church dies, so too are all his doctrines that he promoted. This now explains why Mormons will not study their scriptures and why they refuse to assist in their local wards for service activities.
President David O McKay ordered the Priesthood in General Conference in 1966 to restore the Constitution. They failed to follow the Prophet. President Benson said the Church was still under "condemnation" concerning the Book of Mormon. Only the Seminaries submitted to the President who had merely read the Book of Mormon.
President Kimball gave a talk about the issue that was in President Hinckley's Family Proclamation, showing that no member is following the Prophet.
Members ignore the Presidents of the Church waiting for them to die to justify themselves to not follow them. And instead Mormons will hear revelations and commandments from non-Presidents of the Church and push and enforce them upon other members. Caffeine for example. A President's words are still in effect until a successive President overturns or changes it. I've hear no President of the Church say we no longer need to restore the Constitution, so as far as I know, I need to obey, even if I do it alone.