They are speed cameras, not red light cameras.
That said, the bill addresses this category of abuse directly: if a speed camera fails to reduce 85th percentile speeds or violation volumes within 18 months it must be removed.
There are also substantial limits on how the revenues can be spent. If you are interested in this topic it's worth a read: https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml...
Good call. I consider the precedent set here to apply equally to both cases, and the stop light cases tend to be much more egregious, as I've telegraphed in my top-level comment.