Is the speed limit going to be photo enforced?

Not everyone would get a ticket. Not everyone has a car. I know a child less than 2 years old. I do not think he will get a speeding ticket. And if he is driving at his age, then there is a bigger problem than a speeding ticket.

Seriously though, they can program the photo-enforcement system with to trigger at a higher minimum speed than the posted speed limit. For example, they could have it give tickets to anyone driving at least 10 mph faster than the speed limit, but not to anyone driving 0-9 mph faster than the speed limit. So not everyone driving would get a ticket.

Possibly, in some jurisdictions anyway, but since you didn't mention location while asking on a world wide site, it may or may not affect your life.

But your thought that "Every (one) would get a speeding ticket..." is not factually based. For that to be true, everyone would have to be speeding, all the time, and everyone is not.

Any meaningful answer is going to require a Where At description. Some city's have been trying this for years, but every time a "speeder" comes to court with their citation, they usually successfully argue that a still photo can not show which car in the shot was speeding.