The food is poisoned but will disappear completely and be replaced by bugs. Our money is fake but will turn into an electronic slave system. Our police have been turned into a military affront and will be replaced by robots with weapons who aren't going to hold off shooting us.
The food will be what you and your family can hunt and kill, or grow for yourself.
Barter will make a comeback, and the paper cash being printed out now will be used as fire-starters and ass-wipe.
Police? What police?
Robots? Seriously? Our society is already spiraling down to the point where we can't even keep the lights on, or drink the water. The high-tech infrastructure required to maintain a large enough force of robots to reliably subjugate a human population simply won't exist. Any such force would require regular maintenance, parts, lubricants, etc. Not to mention a reliable power source. Remember the part about not being able to even keep the lights on?
Actually, your scenario is more plausible.
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