Pretty much all of the good points I'd have liked to make have been said in this thread already. I will say though that beyond embryo selection, like Otterly pointed out, there is likely going to be gene therapy treatments for conditions in the near future for young children. I really wish human cloning legislature(and protocols for human cloning itself) could be handled properly though, as some of the best ways to fix complex issues would involve multiple gene edits from cells grown from an embryo and then taking the final product and using that to make a clone that is now free of its defects.
The range of things this could fix is pretty broad, compared to what gene therapy and embryo selection can do. Embryo selection can only make due with the best of what both parents provide and you're trying to pick the best from a set of dice rolls. Gene therapies come with all kinds of issues with their patients' immune system and potential side effects from the genes implanted. Neither treatment on its own could fix something like a chromosomal disorder -- well, embryo selection has a chance to but it's a small chance per embryo. There are techniques to insert or try and remove chromosomes however. Likewise the gene editing that could be done on those cell lines can solve very complex genetic issues, like those that feature multiple genes being faulty.
I will also say that in the absence of you being able to have healthy kids, you could seek out a close relative who can provide their "material" for something like IVF. The child in the end will be more closely related to you than an adopted child is going to be and you'll be furthering your family's bloodline, just a different section of it. Alternatively getting the material from people who are exceptional(e.g. eugenic) is also a good option over adoption if you are able to have kids but are just worried about your own genetics(or your partner is worried about theirs). Exceptional people often make exceptional kids and the world needs every good soul it can birth.
Also, some things seen as defects can have their own boons. Even things that are often seen as generally bad for the development of a child can contribute in just the right way, in the right storm of circumstances, to make great people. Isaac Newton was born heavily premature, as was Einstein and many, many other geniuses and notable people in history. Likewise the line between a madman who writes manic non-sense on his walls with his own shit and a great artist isn't by their proneness to psychosis, schizophrenia, or other mental illnesses. All of this is to say that great people are abnormal and often very flawed, so flaws shouldn't be avoided at all costs. Your child, even if they inherit your proneness to schizophrenia, depression or whatever else, is not doomed to fail.
