Delusison is the right word as hundreds, who knows even thousands of people that pronounced themselves the opposite sex to the one they were born have seen the light and convereted back to the gender they were born as.
Add to that the fact about 40% of them commit suicide, it should by and large die out as the preferred delusion.
I read how women who undergo breast augmentation are 3 times more likely to commit suicide. Should we outlaw that surgery because of it?
I don't comment unless I have done considerable research on the topic and as I have done none on that, no comment.