How much energy do 1 billion people consume? I don’t think this is the criteria we should use.
Edit: though perhaps you're making the point that the AI energy usage is a drop in the bucket compared to its overall usefulness. I agree on that.
Ideally those 1b people would contribute value elsewhere in the world, leading to a big net gain rather than just displacement - and we’re hopefully getting bigger gains for the energy invested. Of course that’s ignoring likely concentration of value, etc.