Theoreteically the capacity to have smart, healthier, longer living children is amazing and a victory for all mankind.

But it won't be for all mankind, just those in wealthy nations and even then only to those who can afford it similar to In Vitro fertilization. The worry becomes further inequality but at a genetic level over just wealth.

If we can eradicate a genetic disease in a few generations, we probably should. But if only the wealthy and powerful are able to then we head toward even more ethical and moral questions.