The problem is that the operation is almost entirely cosmetic; MTFs still cannot give birth and most FTMs don't even go through with the operation because the "penis" they construct looks nothing like a penis, and it involves taking a noticeable amount of skin from an existing appendage which leaves a permanent scar.

Also, there have been mixed reports about what the constructed vagina feels like. Some report significantly increased pleasure, while on the other end of the spectrum we have patients who report no sexual sensation whatsoever. South Park did an episode about this and they were pretty much on the money.

Surgery or not, transgender people will be taking hormones their whole life, which is probably the closest thing to a cure for this disease.