It sounds as if he's a pretty balanced and intelligent young man. Getting kids to read at all these days is no minor feat, let alone read history.
Keep up the great work. You certainly must be doing something right!
Sure you might wsant to suggest other material, but since dinosaurs seemed relatively harmless, why prohibit it?
Humerous story. He was about 6 or 7, and I went into the kitchen and noticed a terrible mess on the floor near the refrigerator. Asked him what happened. Took a while but the story came out. He was pretending to be an Oviraptor. (The egg stealing dinosaur). He dropped a few eggs, and tried to clean up the mess, though not too well! LOL I couldn't be angry, it was just too funny!