My personal system would be based on resource points: Define the amount of resources our planet has in a sustainable fashion, everyone gets the same and can use them how they like.

Technocracy had this already in form of Energy accounting.

Unfortunate something like communism sounds similar and just because we have seen that it didn't work due to technology issues (planning ahead without necessary information is hard?) and no gain of function which would push people, the basic idea is similiar to energy accounting.

Another thing this system needs might be a way for the system to protect itself.

I do think so that a society as diverse as ours will continue struggling with this as long as we do not give abundance resources to everyone or educate/indoctrinate people the 'right' way.

One thought I have regarding AI: IF it happens to slow, people will get used to the status quo and inequality and we will see a future of a handful rich people and a lot more poor people. IF it happens too fast, people might be more desprate to standup and demand something better.