Re: UBI will come - soon
"But the vested interests fighting it will be as hard to overcome as Big Oil, Big Tobacco and Big Pharma."
Given your initial proposition - a completely automated factory with nobody with income to buy its products - why would they fight it? As you describe it it would be in their interests.
But what you didn't address is where does the money come from to pay the UBI so the toasters can be sold?