1. The job of the producers is to produce what the consumers want, not the consumers to accept whatever they want to produce! It is not a birthright to guaranteed profit from whatever they want to produce being sold. That has never existed. It brings to mind every idiot CEo of a business which failed to adapt bemoaning "murder by millenials" and wondering why they aren't getting new customers among those they insulted for products they don't even want in the first place.
2. If credit flow is required for the economic velocity it hints at an insufficient amount of solid currency in the economy and the interest costs are deterring spending exactly as intended. Even if taken for granted that the boost is needed doesn't mean that a consumer credit bubble is the best way to do so.
2a. If saving is not desired behavior retirement must be guaranteed in spite of lack of it. Asking for changes with no viable alternative is a fundamentally an unreasonable demand in negotiation. If you don't want a population explosion as 8 kids is the accessible way to be supported in old age then provide elder's pensions or stop complaining about population growth.
2b. Even if they could keep on using credit until they die the gains would be unrealized as the music stops even after they claimed the estate the debt would be written off. Continually rising consumer debts are a bubble because they are not immortal conglomerate entities like corporations or governments.
3. A drop in demand given available means of payment or credit implies a failure to at the same provide utility and provide a pathway to payment.
Essentially the answer to the economic problem isn't more consumer debt and pretending this fine but solving the root problems in a profitable way.