Bemused,
I've wondered the same thing myself. As we've noticed, some would likely go back because of friends and family, even though they know it is pure BS. Some would leave and begin living their own lives. Some would stay and live their own lives (college, sex, etc.).
The Borg won't do anything that doesn't have a net positive effect for itself, as organizations are egoist. All 3 of these scenarios would appear to have a negative impact on the Dark Lords' ability to control the rank and file and maintain overall order.
As long as they are experiencing a net increase - even if it is based on 3rd world growth - that isn't likely to occur. Growth is a sign Jah is favoring them. They might place sheer numbers (growth) above control, but I doubt it. They have shown a century long tendency to desire control over everything. They will simply re-group, circle the wagons and tell everyone it is a 'cleansing' directed by Jah.
There is one thing I believe could bring about farily substantial changes in the Borg quickly: $$$. If the wealthy countries stopped sending them $ and they had to begin paying for the O&M day to day costs out of their own savings, they might address the shunning. My bet is they have already identified these scenarios and have a list of things they will roll out. It is likely that ending DFing is not on it, as that would provide them the least amount of control. And control is Optimus Prime to the Dark Lords.
Relaxing college, sports, entertainment, etc. and allowing more personal freedom of conscience is more likely their strategy, IMHO.