The reasonable expectation is that cars will not be able to achieve actual self-driving without either AGI or more specialized hardware than a camera. AGI is almost certainly a 'next century' kind of technology. Adding sensors other than cameras (lidar, others) to a Tesla means that they don't have the hardware.

This claim is quite obviously true, because despite the claims of Tesla's people, we don't know of any vision system that works without relying on general intelligence. Human/animal vision in particular is only accurate because we inherently use our knowledge of the world and physical intuition to resolve ambiguity. Put a human (or other mammal or a bird) in a fully artifical environment, without recognizable objects and without shadows, and you'll see that they are about as bad at vision and navigation tasks as many current algorithms. The effect will be even worse if you recreate realistic objects but with unrealistic proportions and behaviors.

Since we can't hope that computers will gain animal level intelligence in understanding the world (no one is even really working on the necessary problems), the only path to self driving is through more advanced sensors, as everyone but Tesla has realized for a long time. This is why Waymo has self-driving cars on the road today (in perfect ideal conditions), and Teslas can sometimes barely navigate an empty intersection without a human driver intervening.