I'd say "Fuck you. Why the hell would I want to come back? You guys think I want to socialize with you... that I want to be around you... that I'm missing you and just sitting around with no life waiting for the chance to be back with you? You guys are legends in your own minds as indicated by your new ministry approach. You really think people want to have conversations with you... to just blow time and chat with you... that you're that important or in that high a place? I wasted 50 years with you. I hung around only because I thought you did know. Now, you're saying you don't know??? So, like, why would I want to come back? You still seem to think you're it - the one and only group on earth approved by God. If you are, then why would he have let you be wrong for 150 years? You're just now getting it right and apologizing? I wanted truth, and now you're basically saying you don't necessarily have it? Nah, dudes, I have a life. Don't need you; don't want you. Oh, and by the way, since you were wrong all that time, are you going to provide compensation to me for my 30 yrs as a fulltime JW slaving for no pay and altering my whole course of life for something that was wrong? Go fuck off."
P.S. That whole radical shake-up thing is based on an assumption that JWdom is at its core approved by God and just needs to be refined. Why would anyone make such an assumption? So, they've been wrong for 150yrs, but the religion is still the one and only true one? How about They've been wrong for 150 years, so that shows they're not the one and only true religion or not a true religion at all?
That shake-up thinking is typical JW thinking. No matter how wrong they've been in the past, they still claimed they had the truth at that time, one GB member in the past even referring to such as "current truth" because that's the way they understood it at the time even though they later changed it. How effin arrogant and presumptuous and self-righteous. It's current truth just because you say it's truth?
Nah, a real shake-up or admission would be for some real lovers of truth to take over and tell all the rank and file they've been in a deceptive, corrupt, harmful, self-serving cult.