I'm a tad skeptical on this.
While bacteria can certainly be resistant to antibiotics, for a strain to become virtually immune to the various mechanisms of antibiotics all simultaneously is… A bit much to believe.
Consider Q's post about the push for antibacterial homes. Mass Effect Quarians. I am not familiar with what research is public at the moment, but the link between the parental immune system and the infant immune system is important. It is probable that our immune system is 'hereditary' in that the cells present from the mother 'program' the infant's immune system for responses to viruses and bacteria through the first year.
In a sterile lifestyle, this process is interrupted and doesn't become obvious until a pimple starts eating kids alive. Antibiotics could simply be replaced with placeboes in the supply chain and the illusion of a new super-bug is created.
Create a society dependant on a sterile lifestyle and then take out the filters and use plain water instead of bleach. Figuratively speaking.