First of all, we need a good monitoring system. It all starts with that. Right now, we don't have the numbers that would indicate where we're at.
The second challenge is the fact that we are a litigious society. Many of those who consult a doctor don't want to argue with the doctor about what to do. They want treatment. That's why they waited for half an hour or an hour before seeing the doctor: they want to receive something. So, one of the doctor's reflexes is to prescribe something, instead of starting an argument or a discussion. We would like doctors to give more explanation to patients. However, some people will be dissatisfied if the doctor doesn't prescribe something after they have waited for several hours in the emergency room, for example. This is another aspect of the problem.
As for when to press the panic button, having a very good monitoring system will allow us to say when, given the resistance rate, we will need to use a new available antibiotic. We don't currently have the numbers that would justify this reaction. I don't think we're there yet. In my experience, I know for sure that situations where this could happen are still rare. However, we need a good monitoring system to react accordingly.