It's a very DIFFICULT task to wake most up, even with ammunition like that. I hinted at the new light to a group of 5 of my 'friends' recently. Their responses were basically: yeah, we understand that change already, wasn't there ALREADY an a study issue some months ago on that teaching? The GB certainly know what they are doing! The light is getting even brighter!
The GB have a cult of personality surrounding them, even though the average JW cannot identify all of them by name or face. To them they are a bunch of very old, very wise men who are ALWAYS RIGHT.
If there was new light at the next convention that circumcision is once again required, most JW males who aren't already would run to the doctor the next day to get snipped up despite the pain and permanent alteration.
@Gayle:
I really don't see shunning / disfellowshipping being revised. Those are 2 of the 3 hooks dug into the back of every zealous JW to get them to remain loyal, the other is 'being killed at armaggedon'.