[baddox]

This is obviously a very simplistic scenario, but I think it's no more simplistic than your scenario:

Sally works at an electronics factory for minimum wage. The factory fires her and replaces her with a robot. The factory then is able to sell some electronic components to Joe for a lower price while also increasing the factory's margin. Joe sells handmade artisanal pocket calculators. Now that some of his components are cheaper, Joe can afford to hire Sally to work as a phone salesperson, making slightly more than minimum wage. Sally makes more money, the factory makes more money, and Joe can expand his business and probably make more money.

[dusklight]

But it should be obvious there are a lot fewer salespeople needed than factory workers, and more importantly, robots don't buy things, so who is buying the artisanal pocket calculators and where are they getting their money?

[qbrass]

Sounds like some marketing jobs opened up.

[damncabbage]

Except Sally now suddenly has to retrain as a salesperson. And perhaps also try to beat out other people which already have sales experience to that sales job.

This takes effort and may be achievable with a lot of gumption, sure, but now consider the entire workforce that just got fired. Are they all going to be able to pull that off?