Watching that video and the helpless state the officer was in, I have to wonder if some/many jurisdictions will mandate a partner to be required in a patrol vehicle. In most cases the partner can be prepared for a bad case scenario as a cover while the other approaches the vehicle. The more ambush type responses that occur, the more officer safety considerations jurisdictions might see. Factor in heavily tinted windows, the approaching officer is really in a precarious position. And at the same time, cops are being hounded about being too aggressive towards a driver or occupant in the vehicle. I really feel for cops today. It is tough and dangerous job become tougher and more dangerous every day.
Alot has to do with population of the city and funding. Notice how most of the bigger cities had 2 officers per vehicle.
In today's situations some departments are changing backup of 1 or more officers on stops for protection of all involved.