My understanding is no, that when Australia brought in the 0.05, the number of charges remained approximately the same. The general BAC levels of people they were pulling over dropped. It seemed as though everybody had one drink or so less. So the people who might have been 170 were now 120, but they were still well above the limit.
One of the things is that there is really a limit as to how many charges an officer can lay on a patrol. It does take time—the two breath tests and so on—so you're off the road for quite some time doing that. Some concern has been expressed that they may be off the road handling a lower BAC driver instead of giving that person a short suspension and looking for a higher BAC driver.