When talking about this, one told me, you actually can. His example was a change about the question whether miscarriages or stillborn babies have hope of a resurrection or not. First the GB said, "No, they don't." But after receiving many letters from concerned JWs they changed this to "We don't know."
IF true then fair enough but this really is an exception. The GB are not immune to reason sometimes and have shied away from certain dogmatic statements over recent years.
You try having an open conversation with people in your local hall about things like:
- the biblical reasoning for the generation teaching and how it's changed over the years
- the complete lack of any evidence for a global flood
- the overwhelming evidence that man has been here for way over 6000 years
- whether or not the organisation needs any reform of it's child protection "policies"
- the increasing super-stardom of the GB
- the inconsistencies in the blood policy
- the UN scandal
- hypocrisy with the situations in Malawi and Mexico 50 years ago
- promoting change to the disfellowshipping policy
and so on....
The fact is that there is no way of being any kind of dissident without turning yourself into an apostate worthy of being DFed.
In this context, the GB deciding they don't actually know if still-born babies will be resurrected is of zero consequence.