I also have really complicated relationship with hope. Mainly, I try not to hope as my body seems to be insanely problematic. I am disabled with multiple autoimmune diseases and genetic syndrome. While objectively I find the advancement in treatment interesting and amazing, I personally try not to hope. It is absolutely exhausting to get your hopes up only for the other shoe to drop.
The good thing for him is that he was so young when he was diagnosed that he probably doesn’t know anything else. Saying this from personal experience as I was diagnosed at 14 months in mid 80s. Of course, something like this would be amazing as I can’t tolerate even small amounts of accidental gluten but as I don’t know anything else I can’t even imagine anything else.