My thinking: How long for each divide-by-ten step? 1M USD today, 100K USD next, 10K USD later. At 10K USD, for these life threatening diseases, it is a drop in the bucket. Any insurance company would pay for it, because it would easily save many times more in avoided treatments for the illness.
Think about the revolution that 3D printers brought. I could see something similar for custom DNA vaccines. They should be targeting wealthy people who want cosmetic effects, like hair regrowth, less wrinkles, hormones like a 30 year old, etc. They can pay, and it will help to mature the industry and production pipeline.