Once upon a time the default privacy model used to be "opt-in". Which then became "opt-out" thanks in large parts to Google. Of course it helped that very few "lay people" take active steps to opt-out.

It appears "rename and opt-out" is the latest model. I'm guessing even fewer lay users will take this step.

Technically this allows Google to claim it gives people an easy way to opt out, but in practice nothing much is likely to change as those who were worried about privacy were probably not broadcasting their SSID publicly to begin with.