> Nobody will buy the product?
Correct, nobody will buy your 1GB stick of DDR2-speed RAM for the $100 it cost you to produce it.
> And what happens when smaller companies have to repair or scale their infrastructure and can't get affordable RAM?
That situation sucks but bringing up more obsolete fabrication isn't going to help. They can't compete with modern chips even when those modern chips have a 5x price penalty.
Ok sorry I misread you saying that it was easy with nm manufacturing but nobody will buy the product, you said it's easy to manufacture micrometer DDR2 speeds.
Single digit micrometer is really easy and makes toys and/or microcontrollers. 90nm is sort of easy if you have factory money, and is about what you need for DDR2. It gets a lot more difficult as you go beyond that.