Yes, I understand this. I understand that they can look for most common answers among correct control responses, and crowd source the OCR of difficult street view images. My point is that is not what the experiment is doing. The point of the experiment is to determine if these images are as effective as the current images used in the tests. For the purposes of that experiment, it would be much easier (and probably more scientifically accurate) to use images where the correct answer is already known. As Google already has a large number of those images where it has extracted street names and numbers, they would have a large sample size to use for this experiment. They do not need, at this point, to use the unknown images.
If the experiment shows the street view images are equally effective, people can debate whether it's ok to have random web users do your OCR for you. Until then I'm not going to panic.