Don't be so sure. Although penicillin resistance may have been first reported in the 1950's, Penicillin itself keeps on going strong. It is 100% effective against the #1 cause of neonatal infectious morbidity and mortality, Group B Strep.
Plain old Amoxicillin high dose remains highly effective against the most common form of pneumonia, Pneumococcus. So does monotherapy Ceftriaxone for pneumonia, UTI, and gonorrhea. And penicillin remains the best and essentially only treatment for syphilis.
It is correct that many other microbes have developed plenty of resistance to plenty of antibiotics. But it's not a lost cause nor a sinking ship. And there is evidence that when doctors improve their prescribing patterns, antibiotic resistance subsides, which is pretty cool.
If you come in to my hospital, we won't run out of options to treat your infection. Next decade, I don't know. But I'm 28 years into my career, and I've heard about how all the microbes are gonna be resistant soon for, oh, about 28 years.
--JS