Well "saving the antibiotics" is very important, O_G.
There is a very strong argument to say we have been very careless with their use, over-presribing them to both humans and domesticated animals, like cattle. The consequence of such over use is that many of the bacteria have developed antibiotic resistance. This is not just a problem for the future; It effects many people, particularly post-operative or elderly or immunocompromised patients right now.
Not sure exactly when the last antibiotic was found, but it was certainly some decades ago. We have been making do with variations on a theme within the different well established classes of antibiotics, and using a cocktail of antibiotics for a long time now, and there is very little evidence of new antibiotics in the development pipeline. This is a worrying circumstance.
There are some new approaches to treating infection and killing bacteria - use of phages for instance- viruses tailored to kill specific bacteria - but these are a very long way from being commercially available.