I think the biggest threat to our cars is going to come from legislation aimed against older cars, but that will focus on city usage.
I reckon overall we'll be ok for the next 10 years at least.
Already happened here. My Euro 3 diesel (12 years old)can not enter the centre of Milan and may be banned entirely in many areas at times of high pollution.
I will buy a new car at some time in the next 6 months and I can only hope that it will be ok for the next 10 years or so.