Antibiotics will likely become obsolete when you can target bacteria without the bystander side effects they have on our cells. They are the perfect antibacterial smart weapon really.
https://medcitynews.com/2020/01/adaptive-phage-gets-10-from-...
Antibiotics will continue to be effective precisely because they are broad spectrum. A doctor can hit you with an antibiotic before they know exactly what you have.
I am always happy to see new tools in medicine. However, I suspect phages are most going to be used initially in persistent, chronic, antibiotic resistant infections where everything else has failed.