Experiments on editing human DNA have already begun, although so far it was only about eliminating congenital genetic diseases. So, in 2015, Chinese scientists were able to make some changes to human embryos. A project to study human DNA editing has been launched in the UK. They did not intend to create genetically modified people yet, but I think this will be done in the near future. My assessment: in a few years.
As for changes in eye color ... The genetics of eye color is well studied, we have ideas about which genes are associated with certain pigments, and how a different combination of these genes gives a different eye color. Most likely, in 10 years we will be able to purposefully receive blue-eyed children from brown-eyed parents (or vice versa).
Technological problems can be solved. However, ethical questions may arise. Even now, many countries have a negative attitude to the ideas of human genetic modification, so new technologies may be banned. On the other hand, they are unlikely to be banned all over the world: individual countries that do not abandon such technologies will be able to receive an influx of investment and genetic tourists. So let's wait!
Theoretically, this is already possible, though not in Russia, in many countries it is generally prohibited by law. It is also worth saying that this is possible only with IVF. In America, 10+ years ago, they made it possible to choose the sex of the child, initially this was invented, of course, for medical reasons, because there are diseases that occur only in girls or only in boys, and it was very logical to choose an embryo of the corresponding sex, but then quite quickly everyone understood that this could be put on stream, because a huge number of people want to have a child of a specific gender. Well, in mid-2008, it was announced that you can choose the color of the child's eyes / hair, though not with a 100% guarantee, but very high anyway, and this is in 2008.