FWIW, since Down's is caused by (we're pretty sure) mitotic error, it can't be completely eliminated from the gene pool. 99% of cases did not occur on hereditary lines. With or without the existence of the treatment, Down's cases would continue to surface. So it's in the category of "treatments parents could choose to apply to their offspring," and generally parents get pretty broad leeway there in choice of the kind of offspring they're aiming for (starting with dating the guy with pretty eyes or the girl with the cute hair thing).

... Whether society is mature enough to recognize that in the presence of that treatment, Down's people will still be born and they have every bit the same dignity-of-human-life as the rest of us is a very important question.

As the parent of a child with Down syndrome, I really appreciate the way you and the parent comment approached this topic. Thank you.

Tiny nit, in the US it’s “Down syndrome”, not “Down’s”. Apparently we name conditions with a possessive if named for someone with it (“Lou Gehrig’s”) and without the possessive if named for, say, the person who first described the condition in a medical journal.

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