I completely agree, but that's a very big "if". I'm not terribly familiar with autonomous vehicle driving systems, but my passing understanding is that there are multiple components working together that help make predictions, and these systems do not rely on any single point of failure.

The classic example of a sticker on a stop sign is, in my view, more of a dramatization than a real threat surface. Designing an adversarial perturbation on a sticker that can cause misclassifications from particular angles and lighting conditions is possible, but that alone won't cause a vehicle to ignore traffic situations, pedestrians, and other contextual information.

Plus, if I wanted to trick a self driving vehicle into not stopping at an intersection, it would be much easier and cheaper for me to just take the stop sign down :)