What do you think trans identity can possibly be other than mental illness? What other options are there?
Neurological issues? As in, something wrong with the wiring of the brain?
(Oops, posted by mistake, sorry!)
Do you have sympathy with the idea that "gender dysphoria" is nothing more than a possible sympton of other mental health issues?
Sure, that's a possibility. Maybe not in all cases, I don't know, but certainly in some.
Do you fear waking up one day and realizing that in mental health terms you are back to square one, only with significant physical health issues to deal with too?
No. My dysphoria has always been there, and nothing has ever created so much as a dent in it, so I have no reason to believe it's going to magically disappear. But should it disappear one day? Heh, cool! One thing less to deal with :)