Antilock brakes and stability control are mandatory now, but they've been common for a long time. Most cars probably still don't have blind spot and lane departure warnings standard, and I'm not sure how much safety they add.

My sense is that if cars are safer now, compared apples to apples (i.e. a base model mid size sedan) to ten years ago, it's marginal. And the same will be true (driverless cars potentially excepted) in five years.