To answer my own question, I realize it's a completely different approach, and that phage therapy more closely resembles anti-biotic therapy.
I pulled this from the website of a company that specialized in it, which gives a good explanation:
"While bacteria may develop resistance to phages, it is incomparably easier to develop new phages than new antibiotics. In nature, as bacteria evolve resistance, relevant phages will evolve in concert. While this adaptability is most often played out in nature, it may also be harnessed in the laboratory. A few weeks are needed to obtain new phages for a newly-emerging strain of resistant bacteria. This is in favorable, sharp contrast to the seven to twelve years required to discover and develop a new antibiotic and get it approved by the FDA in the US. In other words, when a highly resistant bacteria subspecies (known in the press as a "superbug’) appears, a "superphage" may be readily isolated and produced against it."
Trying to stay on-topic here.. I was just curious to learn more about the larger space of the post-antibiotic era: and solutions to it in general (e.g. natural killers, phages, defensis mimics, etc.)
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