Elon Musk said AI could create a future where all of humanity is wealthy. Bill Gates and OpenAI CEO Sam Altman have less radical ideas of what the future may hold.Getty Images and AP PhotoWhat if AI doesn't just change the future of work but eliminates it entirely?Elon Musk has referred to this possible future as "universal high income."Musk isn't the only name in tech to ponder just how different work could be in a post-AI world.Is this heaven?…