Any suppression of testosterone can have far reaching implications in males in terms of bone health/osteoporosis, psychological effects on libido, depression, sense of well-being, Anemia, coronary artery disease, etc. Whether or not they are given 'normal' or 'high doses' of meds like lupron does not necessarily determine the possibility of these complications.
In the setting of childhood development, the effects of even mild suppression with 'low' or 'adequate' doses could result in unpredictable and lifelong consequences related to at child's general health, not just gender. It's not a treatment course to be approached lightly.
I deal with a number of patients with GID (granted, they are adults, not children). Truth of the matter is, it's not a choice even an adult can make lightly-- you have to undergoe a psychosocial evaluation, be well established with a psychiatrist and counsellor, as well as a primary care physician in addition to an endocrinologist. The whole OMG FOX NEWS LESBIAN PARENTS issue aside, I think if you have established GID in the setting of a significant history of gender dysmorphic behavior, i suppose treatment is a consideration. But I doubt we have e whole story here.