The value of our labour is what enables us to acquire things and property, with which we can live and do stuff. If your labour is valueless because robots can do anything you can do better, how do you get any of the possessions you require in order to do that something else you'd rather be doing? Capitalism won't just give them to you. If you do not own land, physical resources or robots, and you can't work, how do you get food? Charity? I'd argue there will need to be a pretty comprehensive redistribution scheme for the people at large to benefit.