How many pre-67 cars do you think are on the road that people use as daily drivers? Those that are out there are typically driven by people who care for and love these cars. They are driven carefully, not by some sleepy commuter eating breakfast and texting on their way to work.
We have enough nanny laws thank you very much. Adding another would be stupid, expensive and show no measurable gains in reducing injuries or saving lives. However, this type of thinking could lead to outlawing older cars without crumple zones and airbags.