The treatment planned is highly speculative, as I understand it has yet to be tried on patients. What is more even the doctor offering the treatment has said that when he offered it, he did not realise quite how severely handicapped this little boy is.
If this child receives the treatment and it works, it still will not reverse the severe brain damage he suffers from, nor remedy any other of his exiting disabilities. The kindest outcome is that he should die.
I do not write indifferently. 25 years ago my (adult) sister received severe head injuries in an accident, the doctors operated twice, but told our DPs that if she survived she would be profoundly disabled. My mother said that she never thought she would ever pray for the death of one of her children, but when the doctors told her of the level of disability that was the best that could be expected, as a loving mother, she knew that the best outcome for my sister was that she died of her injuries, so that is what she prayed for. My sister died and my mother always believed, painful though it was, that that was the best outcome.
Sadly I believe this would be the best outcome in this case as well.