What will happen to large companies once poor people have no more money to use?

The whole model they operate on is unsustainable. Either Blackrock and vanguard keep them afloat. Or they'll take on personal loans, issue out corporate debt. Or find ways to downscale, either job losses shrinkflation. Or raise prices. These are all desperate measures and are signs of an unsustainable company.

Losing the middle class (if that's their target market) is a company's biggest downfall.

And I feel that the little people will start to lose hope cause it feels like it doesn't matter... But it's similar to someone on credit card debt. You can only do it so long before it starts to catch up.