Final answer:
The careers of medical staff will likely be done differently as they adapt to administer the new medicine and shift their focus from surgery to patient care and pharmaceutical management.
Step-by-step explanation:
If a new medicine reduces the need for a common surgical operation and must be administered by medical staff, the careers of the medical staff will most likely be done differently. Medical professionals would need to adapt their skills to administer the new medicine, and their roles may shift from surgical to more pharmaceutical management or patient care. As medical procedures and treatments evolve with the advancement of medicine, medical staff need to be flexible and ready to learn new techniques and approaches, ensuring that they continue to provide high-quality patient care.