Being a transgender person is no more a mental disorder than is being left-handed. Further, just like atttempts to 'cure' being left-handed, trying to 'cure' being a transgender person causes only harm to the treated person, and only serves to make others slightly more comfortable around the affected person.
I fully expect that in the next 50 years we will see that being a transgender person is simply another form of intersex fetal development. We already have a significant body of evidence showing correlations between variations in fine brain structure in specific regions and one's gender identity and orientation.
I do not expect this sort of research to lead to a definitive 'instant diagnosis' or a 'cure', as the trillions of pathways that are involved in the brain have almost uncountable possible configurations, and attempts to definitively interpret all of these would br problematic. Attempts to 'cure' by restructuring the brain would constitute a horrific 'death of personality', unethical in the extreme.
By the way, I strongly suggest avoiding recently coined terms like ->-bleeped-<-, which are intended to signal that being a transgender person is merely a lifestyle choice or a belief system. This is not. Accepting myself and living as my authentic self saved my life. I did this in spite of knowing I would become a marginalized person and surrender much of the privilege I held in this culture. I feel very fortunate to still have housing and resources to continue my life.