The theory about ending disfellowshipping seems like a stretch to me. It is JW's primary method of control.
1-they brag that they are better people (more moral) than most, fewer divorces, more righteous behavior good citizens etc.etc.
2-this is how they identify themselves, they are always right and any views outside of their own are always wrong
3-there is no way for them to enforce the behaviors they want to brag about without forcing out the people who won't agree and disallowing the notion that disobedience might lead to happiness to take root in the minds of the congregation
For example; you have a sister who is having marital troubles (husband hits her, watches porn and is emotionally absent) the elders are going to counsel this woman to remain married to her husband, God hates a divorcing etc. But what if this sister knows of another sister who divorced her husband and although not a witness anymore, she has found happiness and stability? The witnesses regularly block this awareness from taking place by booting out the person who has disobeyed and demonizing them (have you ever heard of a disfellowshipped person who was not a 'drunk' 'whore' 'barfly' ?)
The witnesses have to separate the disobedient ones from the flock in order to maintain control over those that remain. I don't think disfellowshipping will ever be done away with.