Also antibiotics would still be good against most bacteria since only some have evolved antibiotic resistance. I know they can sometimes spread to other species of bacteria, but they still would be at a disadvantage outside of places that use antibiotics. If you just got cut or something with random bacteria in it wouldn't you probably be ok?
You are right bacteria have proven very cable at appropriating useful DNA from across the species. Also, we can reasonably expect drug resistant bacteria to spread just like other bacteria spreads (i.e varied methods and levels of difficulty). Among the factors that affect the spread of bacteria is the mobility of the host. If a host dies in timely fashion the bacteria spreads less and if they linger around longer the opportunity to spread increases. Like other infectious pathogens, this is mainly species dependent. When a multitude of antibiotic resistant bacteria spread around sufficiently are a common stay in the ether then they become part of the random bacteria that would likely infect if you just got a cut.
1. neither that those superbugs will come to dominate the bacteria responsible for that disease (superbugs might never be strong outside the hospital, say)
2. nor that superbugs will emerge for many other diseases.
She's painting a worst-case scenario, which has a consciousness-raising value, but no one should be saying that doom is upon us.