What if ....
They revoked the policy of shunning disassociated ones to let all the awake JWs leave the organization so that they're left only with zealous, true-believing JWs, then 3 or 4 years later they issue "new light" reinstating the shunning process for those who disassociate and apply it retroactively to all who disassociated when they relaxed the policy. Then 3 or 4 years later they again issue new light revoking the policy of shunning disassociated ones. So it's a flip flop of no shun - shun - no shun.
Why would they do such a thing? They get to have their cake and eat it too. How so? First of all they get rid of all the current secretly disloyal JWs which would reduce their numbers a bit - but I doubt it would be cut by more than 10%. This drop in numbers will give Watchtower an excuse to cut spending and beg for more money - to a greater proportion than the drop in numbers actually justify. They would actually take in more money because awake JWs aren't contributing money to Watchtower anyway and are actually costing them money by having to print meeting materials for them. So allowing secretly dissenting JWs to leave helps their bottom line and gives them an excuse to further cut output and hoard more money.
Secondly when they reinstate the shunning process a few years later this serves to dissuade too many JWs from leaving the organization. It's like blood letting in the old days. You make a cut to drain out some blood but you don't want too much blood draining out or the person will die. But this does something else that's very important: It teaches JWs that just because Watchtower stops shunning today doesn't mean it's safe to disassociate because there's no guarantee they won't reinstate the process tomorrow only to have you being shunned by family unexpectedly.
Once this psychological effect has been achieved they can then finally permanently disband the policy of shunning those who disassociate with little fear that most JWs will disassociate. Then they can say to the media and the courts that members are free to leave at anytime and they don't practice shunning. See how that all works?
And if at any time in the future they find too many are disassociating they only need to temporarily reinstate the shunning process to control the situation. Or maybe they would issue some new policy to sniff out the reason why a JW wants to disassociate and if it has anything to do with the JW disbelieving the organization or its teachings then they would DF the person for apostasy before the disassociate. In other words it would become more difficult to disassociate, in that you'd have to prove to a committee that you're not an apostate in order for them to accept your disassociation and not DF you for apostasy.