They might just get a "refinement" type blast of Noo Lite and calculate the thing so that they celebrate it on the right night.
Getting people to go and observe nothing happening on the wrong night is simply laughable.
As they have established that it does not matter how many partake, because the GB is the FDS in terms of power and teaching etc, they could always suddenly get Noo Lite that all should partake, they could still have earthly hopers and the elite heavenly class, even if all partook.
I do not see this happening, they are aware that great upheaval is caused by such changes, they will only do it if it is an earner in some way the $ speaks to them much more than the Bible does. It may attract more members if they did not have such a weird take on the communion meal.