The article isn't about the drug, but a new preemptive approach. When the bacteria evolve, we will already have the weapon ready to destroy them. Ultimately they will disapeear from the earth. Yea science!
Can't tell if you are being sarcastic, but if you aren't, I doubt it. and I doubt if it's desirable.
We are symbiotic with countless bacteria. A better approach in the long run would be to strengthen populations of harmless bacteria, ones that can keep the baddies in check.
Of course you mean "When strains of existing inferior bacteria that are resistent to the particular antibiotic and already present emerge in greater numbers because the superior competition for resources has been negated by the antibiotics...".