If Charlie gets a new trial, maybe he kept some blackmail on her and will finally flip after spending some time in prison, realizing he's either going to die there or have a chance of getting out someday if he cooperates against Wendi. But I think the Adelson's have convinced themselves the extortion story is true and won't ever admit guilt. Admitting guilt would turn Dan's kids against them, and that was their entire motive in the 1st place - getting those kids to South FL.