Letting him run off is not a workable strategy.
With that kind of strategy, the perp could keep running every time he is confronted. The correct strategy I believe is for the single officer to follow the perp until reinforcements arrive. At that point they still must catch, tackle and cuff him.
If police departments had more funds, they could patrol with more K-9s to help them chase down people who run away, or just act as a deterrent to people who might be thinking about running away during a stop.