I am not asking this to be transphobic or anything but I had this debate with myself at 2 o’clock in the morning and every time I remember it I can’t focus.
On one hand, it is what they want. Let’s assume it causes no harm to them or any unforeseen circumstances.
On another hand, it would erase their identity as trans people. At the extreme you could consider it a genocide, since turning them into what they want would mean there is no more trans people and their unique identity is erased.
I think the more interesting follow up would be who this actually affects. Does this magic have a magical objective truth about everyone, or is it based on personal belief. The resulting chaos from either way is fun to think about imo.
egg_irl community would go nuts, for starters. All the anti-trans people being outed as closet trans too. Which religions would try to play it off as an act of god? This is what keeps me up at night.