Sounds like you are discounting the possibility of truly sentient AGI. Most experts are not. The world will change again when it arrives, maybe for the better, maybe for the worse.

You're also not accounting for possible political change. When the rich own the AI that creates everything, I hope we'll legislate for distributing that wealth.

Also, art will become meaningless to some creators, but not consumers. For us it will be better when AI makes it easier. Imagine having more, better AAA games to choose from and play cooperatively and competitively with other people. I think the meaning of life for many will be based on our accomplishments and communities in virtual worlds.