So this has been reported for years now. We aren't running out of antibiotics. We are running out of options like you said. The real reason is that doctors would prescribe stronger antibiotics than were needed. Also, people would stop taking the full course because they felt better before then, and lastly, farms give antibiotics to their animals just in case, so any bacteria that would survive any of these is allowed to reproduce and become resistant to antibiotics.
So this has been reported for years now. We aren't running out of antibiotics. We are running out of options like you said. The real reason is that doctors would prescribe stronger antibiotics than were needed. Also, people would stop taking the full course because they felt better before then, and lastly, farms give antibiotics to their animals just in case, so any bacteria that would survive any of these is allowed to reproduce and become resistant to antibiotics.