That would massively drive up meat prices and anger voting consumers who won't be able to afford meant anymore, and also anger voting meat producers who will go bankrupt from slumping sales and have to lay off workers, all of which who will direct their anger at the politicians who restricted the use of antibiotics in animal farms. So not gonna happen politically.

Consumers have to either accept higher meat prices (not gonna happen), or accept that we're too many consumers on the planet for everyone to be fed with organically grown meat (also not gonna happen), so we just kick the can down the road and sweep the dirt under the rug until the titanic hits the iceberg and there's no way forward anymore.

Here in the rich EU countries we have some rules and regulations on meat production, but enforcement is very lax and it's an open secret that those certification seals of approval are basically worthless as animals are still caged together crowded in their own filth, with massively infected open wounds full of puss, and pumped full of antibiotics just to stay alive long enough to become burgers. You should Google those images if you want to become vegan but lack the motivation.

It's a political tragedy of the commons that's found in a lot of other areas in our lives/society which we know for a fact are wrong and are harming us (or others from less fortunate parts of the world), but we still stick to them because they're very profitable industries generating $$$ and jobs, and they're such a tight part of our daily lives, they're nearly impossible to undo today, like all the pollution from car dependence, microplastics, the cheap cocoa and coffee industries driven by slave labor, etc.

See the dead body spaghetti episode from Rick and Morty, it's pretty good satire on our collective hypocrisy on this topic.

We know those are all bad, but we choose to look the other way and not do anything about it because we love our lifestyles with cheap car traveling, cheap shipping, cheap meat, cheap coffee, cheap clothing, etc. and all the associated profits.