While only a handful or two of teams at each regional will be CONSISTENT autonomous (>80%) scorers, I believe that many teams will be able to it between 25%-50% of the time. There are ways to place the keepers that give a fairly large margin of error, and other ways to sense the rack once you get near it (aka ultrasonic sensors/touch sensors/etc.).
What will really be interesting is what consistent teams do AFTER they score a keeper
