Adaptation is unrealistic in cases where adaptation costs a lot of money or creates other maladaptations. The world's adaptation that needs to be done for colorblindness is simply not making color the only differentiator between states. And if you have to do so, using one of the many free, publicly available sources to choose a palette that is colorblind-friendly.

For example, in a traffic light, both color and position are status differentiators; the top light is stop and the bottom light is go. Many buttons are both colored and have symbols/shapes on them associated with the color. Even using entirely different senses are helpful; crosswalk signals near me use color, position, shape, and audio, the last because blind people can't see color or shape.

Color in general is just not a great sole associator, even for fully sighted people, because perception of color can change depending on environmental conditions, and because meaning of color is not standard across cultures.