Looking into this myself, it seems that there are reports that say it's simply stopping the treatment will let puberty trigger as normal. However St. Judes makes a point to inform people that there are long term effects that are not reversible such as https://www.stlouischildrens.org/conditions-treatments/transgender-center/puberty-blockers limited genital growth, which may not be a big deal for women, but there is bound to be a further long term effect on a boy who had blockers for sometime only to find himself in later life with an underdeveloped penis.
They also point out that long term effects are not yet known, as this is fairly new science so it's hard to tell at this point. Plus there are several other short term effects as well, but short term ones aren't a big deal and can be mitigated with treatment, though I find it funny that you'll need treatment to address the issues of your other treatment.
This isn't the same thing though. This is a physical deformity that can be corrected with no adverse harmful effects. You saying that it could lead to death is an exaggeration and is like trying to say that a child should have a brain tumor removed because it might result in death, when the outcome is death either way.
The Controversial Research on 'Desistance' in Transgender Youth | KQED
For decades, follow-up studies of transgender kids have shown that a substantial majority eventually ceased to identify as transgender. But some gender researchers say that research is faulty.
Prospective outcomes
Gender dysphoria in children is more heavily linked to adult homosexuality than to an adult transgender identity, especially with regard to boys.[2][3][4] The majority of children diagnosed with gender dysphoria cease to desire to be the other sex by puberty, with most growing up to identify as gay, lesbian, or bisexual, with or without therapeutic intervention.[5][6][7][28] Prospective studies indicate that this is the case for 60 to 80% of those who have entered adolescence; puberty alleviates their gender dysphoria.[29] Bonifacio et al. state, "There is research to suggest, however, that [some desistance of GD] may be caused, in part, by an internalizing pressure to conform rather than a natural progression to non–gender variance."[30]
Data is suggesting that most young people who experience forms of Dysphroia grow out of it at quite the majority. Some studies suggest it's as much as 93%, while others realistically believe closer to 65%.
But what studies suggest now, is to hold off on puberty blockers in youth and instead encourage social transitioning first. Letting the child live the life of whatever gender this prefer and waiting to see if long term commitment to the differential gender holds.
