Only ones with a presumed irreversible tipping point.

To be clear, the issue of antibiotic resistance is not such a problem. Generally, resistant bacteria are less fit than their nonresistant counterparts in the absence of the antibiotic, so we should expect that after a period of disuse antibiotics would once again become useful.

I doubt that people would stop using antibiotics. They'd use higher dosages, complex coctails, etc.

We may not need to wait nearly so long.

This is a quote from a book by Nick Lane that I think would be relevant here.

"studies show that bacteria can lose superfluous genes in a matter of hours or days. Such fast gene loss means that bacterial species tend to retain the smallest number of genes compatible with viability at any one moment."

The main reason he claims is that for bacteria, the speed of DNA replication is generally the limiting factor in speed of cell division and proliferation of said bacteria, so selection pressures lead to more favorable outcomes for the bacteria that maintain the smallest functional genome.

The book is Power, Sex, Suicide: Mitochondria and the Meaning of Life if you or anyone else is interested. Fascinating read I would recommend it.

Interesting, haven't heard of that observation or the book. Thanks!

Possibly, but you must bear in mind how rapidly bacteria reproduce and evolve. I'm not well enough informed to say exactly how long it would take, but I very much doubt it would be hundreds of years. (And people wouldn't necessarily die of simple cuts regardless -- we still have our immune systems and other means of sterilizing wounds.)