The article's amazing for being a look into a future that could've been. A number of physics tools that are around now depend on microscale cryogenics, but they're still fairly rare (like SQUIDs).
It feels like the main limit to mass production of this technology (if people wanted it) is the cryogenics system involved. What other barriers (other than lack of demand) are there to, say, placing a superconducting device in a mass-market product?
Googling around indicates he died suddenly of pneumonia-like symptoms. He was working with chemicals whose fumes could have caused that (HCL, e.g.).