I can't imagine what form a reformation would take, but if they gave up their authoritarian ways and stopped oppressing their people, I wouldn't return as a member but I would be willing to attend some cultural or social gathering as a token that the conflict was finished and there would be peace between the WTS and its disaffected apostates at last.
The Watchtower Society Reforms! Would you go back?
I would like to re-establish a relationship with some family members if they were freed from shunning requirements and they approached me. But as far as the WTS, I don't care what they reformed, I would still want them to eat shit and die.