Worldwide Church of God [hope I have the name correct] commented on the church's official apology regarding doctrinal error. That admission wrought a massive walkout - was it some 50 to 60 percent?
And why wouldn't they leave after changing their doctrines to be very close to orthodox Christianity. They had a onerous tithing system and met in rented facilities. Why pay 15% of your income to be meet in a gym and hear scripted WWCG talks given by a layman elder type, WHEN you could join a real church with programs, fellowship, childcare, preschool, youth groups, a real professional clergy staff and a nice building you own for a cost of say 1/3 the WWCG was charging you to be one of them.
It surprises me that they retained as many as they did. The WWCG members did not work as hard at antagonizing and ridiculing the churches as JW's have, so it will be much harder for JW's to walk out of a KH and join a church , if the WT should ever become more orthodox in it's teachings.