Who is the Lehman Brothers of the new securitized debt? That meltdown is coming.
I think multiple sectors of underfunded pension, student debt and auto debt all coalescing at once is the problem, not any one of them individually. You're also negating that folks defaulting, massively hinders their ability to move in the financial system. And yes, you can put cars back into the system the same way you can put houses back into the system, but it doesn't matter if no one wants cars.
Quite the contrary. Lenders will lend to you immediately after bankruptcy because you can't default again for seven years, for example. If you have bad credit, you can still get credit! Just at a higher interest rate. I am familiar with lenders who will get you a mortgage the day after foreclosure for 200-250 basis points over conventional rates (6-6.5% versus 4%, in this case).
Economic drag due to student loan debt that can't be discharged is a separate issue (with those debtors delaying or opting out entirely of home ownership and/or children). Pensions will get dumped onto the Pension Guarantee Corp with a reduced benefit payment to those entitled to such, and any federal debt will get inflated away through the Fed (not great, but what happens when you have your own central bank).
As I said, I think the only "great unwind" or credit crunch in the near future is corporate bonds.
Subprime auto lenders: https://www.cyberleadinc.com/subprime-auto-lenders/
Nonprime mortgage lenders: https://www.nonprimelenders.com/lenders/
Prime = good borrower. Subprime/nonprime = not a good borrower.
Just quick examples, lots more out there. It is incredibly difficult not to qualify for credit entirely. Someone, somewhere will lend to you at an interest rate in accordance with your risk profile. Investors are hungry for returns.