Actually, I'm pretty sure that human tribes with this little technologie would survive. Humans developed a special perk which made them sucessful in evolution: Empathy. This ability makes them look out for each other and work as teams, as well as enabling them to tame other species. So tribal humans were quite good at surviving.
Also i think there were enough equally dangerous animals around back in the stone age. Maybe even more dangerous. While Dinosaurs themselves where often pretty mighty, "newer" predators like wolves or large cats where smarter, faster and equiped with better senses than the dinos.
In my opinion, the biggest threat would be the Raptor-like Dinos and flying predators. But a spear should be a decent weapon to fight of Raptors.
"Survival of the fittest" is how evolution works, not "Survival of the strongest." The Human ability to adapt to environment, even with very basic technology is not to be underestimated.
Those inhibitors you mention are still an possible addition, but i don't think they're necesarry.