why use an enhanced human when you can use a robot controlled by an advanced AI.
in the real world robotics already beat humans and cause unemployment. augmentations above human norms
would first become financially viable i think in professional sports. Using deus EX as an example is just a stepping stone on the way to
a full blown merger of human and artificial devices implanted in our cells much like mitochondria. eventually every cell in out body will have its own information processing core and access to a local area network all powered by the existing fuel supplies in the human body: specifically ATP. what you see will be altered by the artificial symbiont in your eye's that will stimulate the nerve endings overlaying a game layer of new information specific to the user. no need for computer monitors.
i think physical augmentations too he human body can be superseded by robotic forms, thus it will all come down to the persona ability to process information and make choices the are valued by the economy. can you pilot a loader or pick stocks that go up in price or paint.
As unemployment grew for the augmented i think non discrimination laws would be passed.