J.R. Brown said about half the DF's go back. I know of some who did. I know some who went back and promptly faded, some who went back and were "BT" JWs (Barely There), a few who went back and quickly got DF'd again usually before they even got privileges back.
But the one that takes the cake (in my opinion) is the former PO of my parent's congregation who had been giving DC parts for years getting disfellowshipped a couple of months after giving the rousing talk, "Abhor What Is Wicked, Cling to What Is Good." Only after his reinstatement did I discover that was his third DF. He is now a Ministerial Servant and Regular Pioneer.
Half come back? Of those, how many are DF'd again or become inactive or irregular? The other half didn't come back, they are gone for good. No more pretense for them. And the DA's rarely go back either.
I wonder what the rank and file JW would think if they knew what the statisticians in New York knew. I wonder how we can get that information.
Respectfully,
AuldSoul