I had read the article but didn't see the video. Happy I came across this, really amazing stuff.
Obviously, real life is way more complicated. But why don't we see antibiotic resistance happening faster in the wild, as the video would suggest...?
Not a doctor or biologist but I'm guessing that the evolution seemed so rapid was due to the perfect lab conditions and the ramping of dosage instead of just from nothing to very strong. Also, it's giving the bacteria a safe home from which to launch their next wave of attacks, vs taking the no antibiotic zone and dropping an anti-biotic bomb on it as would be the case if you e.g. Had an infection then began a strong course of antibiotics. In the human body you'd also have other factors (immune system etc) working against the growth, so it's not just the antibiotics which would be killing off the bacteria.
You do, but your immune system really only needs a small boost to kill the infection, so while you might end up with a significant fraction of resistant bacteria at the end of a 14 day run of antibiotics, your immune system kills them all eventually.