If I were to guess, once self-driving cars are widespread, cars won't be pulled over any more for driving-related issues (ie, cops won't radar any more). However, they will probably be required to have a kill switch that can pull it over for other reasons (ie, if the cops thought your car was the getaway vehicle from a bank robbery)
This is of course once almost all cars are self-driving so it'll be interesting to see what happens in the midterm.
Cops pull over cars for traffic infractions for three primary reasons. The first is for driving safety, the second is for revenue, and the third is because it leads them to arrests of idiot criminals who can't be bothered to fix their tail lights.
The revenue part is coming under a lot of scrutiny recently, since it's being proven to have very regressive effects. The Federal government will make it more expensive than the revenue they generate from it.
This is of course once almost all cars are self-driving so it'll be interesting to see what happens in the midterm.