OK, good question. IMHO, don't get him a camera, get him a good book on photography. Take him to art museums and teach him the rules of composition, the role of light and subject. Discuss with him what makes a good photograph. Then share with him your camera, and gently critique the images he takes. Once he develops an 'eye', then work on the mechanics of taking a photograph. These are all mistakes I made with my kids. I personally think it's better to share the experience with a child, rather than turn him loose with a camera and let him wonder around with no focus (or guidance). You will both be better off for the experience.
Disagree entirely. I feel his own way of seeing things first. Then later see what others have done. Please!
We want our kids to have their own vision which will transcend ours. We want unique artists rather than our clones. IMO.