Which is the correct form, "Robotics is no longer […]," "Robotics are no longer […]," or "Robotic is no longer […]"?
Robotics, although it's a plural noun, is treated as a singular noun.
See terms like Linguistics, Statistics or Economics, just to name a few.
Robotic can't be used, because it's an adjective, not a noun (like Robotics), so:
Robotics is no longer [...]
If you're using it as the field of study it is singular.
Robotics is my life.
If you're using it to refer to the components of a robot then it is plural.
The robotics are defective.