There has been little reliable evidence to prove this, despite your lack of surprise. Science requires confirmation with data to ensure that the obvious is in fact true. Otherwise, it's Scientology.
And you must remember that a predominant view out there, especially amongst clinicians, health specialists and hospital administrators, is that bacterial resistance is a modern phenomenon. Just like you said yesterday regarding the public's knowledge , sometimes it takes a big splash to wake people up to see something significant occurring in their midst.
Also, the fact that these bugs could easily of countered our current "last resort" drug (vancomycin) is quite striking.