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I fully expect in 30 years few people will die from cancer, but instead we'll be dying from things like antibiotic immune staph and strep.

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If we can design CARs for cancer specific markers or have the technology to create other immunotherapies, I don't see why we couldn't do the same for any antigen including antibiotic resistant bacteria. A quick search shows that there is some work in this area already.

In theory sure, but cancer affects you within month or years, while viral or bacterial infection hit you in hours or days.

With bacterial and viral infections, is the problem that your immune system doesn't recognize the invader, or is it just that it gets overwhelmed?

Agreed. Cancer is random and having a genetic likelihood of a treatment-resistant cancer reduces the chance of that sequence spreading. Unlike cancer, bacteria and viruses mutate as they move through the population and slowly become resistant to everything we throw at them. Being treatment resistant is a help, not a hinderance to their genetic propagation.

With growing global density and antibiotic abuse, it's the things like MRSA and syphilis that are likely to never disappear.

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