That legally blind driver who killed a pedestrian will now be facing felony charges. Previously, the DA was only going to charge him with a misdemeanor (which would result in little or no jail time). Concerns by the public for the DA to enforce the law seems to have worked:
[District Attorney] O’Malley says there are just too many aggravating factors for the charge to remain a misdemeanor. First and foremost, she says, he is legally blind. “There was also some half eaten food in the car.”
She added that our inquiry prompted her office to take a second look at the case. “When the press comes and speaks back to us, about what they’re seeing, that we listen very closely, because your eyes and ears are very keen, as I hope law enforcement and my office are.”
Systemic Failure 
Unfortunately, it taking a public outcry for THIS ONE CASE proves that the failure is indeed systemic.
And an outcry doesn’t necessarily lead to anything. There was the case of the man with a cane in the Tenderloin, crossing the street in a crosswalk, with a green light, who was run over by a turning shuttlebus. And it was caught on video: http://abclocal.go.com//story?section=news/local/san_francisco&id=8545736
To my knowledge, that resulted in nothing whatsoever.