This line of reasoning doesn't really apply to antibiotics - because you're likely to get another infection in your lifetime, and many people have infections at any given time, they're perfectly fine eradicating this one.
Believe me, in the infectious disease space, drug companies tend to look for cures and prevention. For example, Merck and GSK spent staggering amounts of money on the HPV vaccine.
As a side note the article seems very well written for non-medical folks like myself.