The more I think about this, the more I believe this is much ado over nothing. I remember when they cancelled the book study night a few years ago. The letter was read at a CA which was very unusual. The reaction? The loudest appaluse I've heard in YEARS.
If they eliminated the D2D, there would be a standing ovation. Most JWs HATE it.
They make doctrinal changes on a pretty regular basis and no one seems to really care. Their MO is to slip it into a WT study or a QFR then reinforce with CO talks, DC talks, and other WT articles. I just don't see them doing anything doctrinal.
They're constantly making changes, so while I do think the school will have some changes, I think it will be procedural. They want to explain face to face and then issue a BOE letter with the details once everyone has had the "training".