Ah, you're one of those people who irrationally worship laissez-faire economies. It's amazing to me that so many people can honestly believe it's a perfect self-regulating stable system, when every single assumption behind it is undermined by capitalism, and there are many incentives to do so, not to mention the real, physical, natural world. It's the epitome of human anthropocentrism.
Since both the consumer and producers rely on each other, one will never become more "powerful" or oppressive towards the other.
This is incredibly naive. Private ownership is fundamentally and unequivocally oppressive and an instrument of power. Most ownership that exists today was established centuries ago. Defending the current structure of ownership is social Darwinism.
And with automation, there is no need for workers to exist anymore. People who own the robots can simply choose to produce things for themselves and that's it. Everyone else becomes irrelevant.
Now to answer your qualm on the vitality of capitalism in the age where everything is automated, it is not still not a threat to capitalism on a wide scale. Capitalism in the machine age still follows this laissez-faire and consumer-producer relationship.
So, "magic". You have an unreasonable amount of faith in these abstractions. The consumer-producer relationship is completely undermined in a near post-scarcity society. There is no reason for consumers to provide work, they can only consume. Capitalism cannot survive in such a scenario.
You are probably thinking of "economics" as if it meant capitalism. It's a very typical misunderstanding, and it's very sad that people think capitalism invented so many important concepts in modern society.
Now, if you want to talk about the welfare of workers themselves, this is another discussion altogether.
I'm not even going in that direction, really, because I don't
I personally don't see this as an enormous issue we may encounter as I believe that capitalism will always produce new jobs for an ever-growing work force, as long as it is left untouched by the state.
Then I'm afraid you have absolutely no idea what automation is going to do with our society. You are probably thinking automation means mechanical robots flipping burgers or in assembly lines.