Previous process nodes are alternatives, but it takes months to years to redesign and manufacture devices using available parts. What if the new car supply (because cars have a crazy number of processors in them) suddenly dropped to 5% of current rates? What if you weren't able to purchase a new computer (or any parts - DRAM, GPUs, motherboards) for five years? What about appliances - if your microwave breaks, and you can only buy a used one for 4x the new price, what do you do?