In today terms he is right though. Because what is costly today will be free soon thanks to productivity gains.

It's just that the inequalities (which some view unfair driving envy) will remain even if most of the today's problem have indeed been solved in the future.

He seems aware of that:

https://x.com/elonmusk/status/1991340672532771224?t=_U4pzLiY85VkajjK-d-8_w&s=19