Bill Gates has been saying this many times and I really, really don't get it.
Of course when the price of a commodity goes up, demand goes down; but if there's a perfect substitute that's free, demand for the non-free alternative should be zero anyway, so its "price" is irrelevant (as long as it's non-free).
Why would anyone hire a human at any cost to do a repetitive and low-added-value job that a robot can do perfectly, without error, without ever arguing or getting tired, etc. AND AT NO MARGINAL COST??
How does "minimum wage" matter in this scenario?
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Humanity has been wanting to not work since the dawn agriculture, 10 000 years ago at the latest. It's finally happening and we're freaking out about it.
What we need to think about is not how to get people employed, it's how to redistribute wealth so that what you earn is not somehow morally related to the job you're holding.
The solution is universal basic income, not "minimum wage".