The PCI bus will also dominate the industrial market. CompactPCI will play a major role. But that's not the reason that PCI technology will become dominant. This two year old association already has over 90 member companies, and includes IBM, DEC, HP, and Force on its Board of Directors.
Any company is free to make or buy products to the standards it supports.
The Industrial Versions of PCI Technology Desktop computers have been used in control systems for the last decade. The trend started a decade ago. For example, in 1985, one user had already rigged a desktop IBM PC to control part of his process in a cement mixing plant. He protected the system from dust with a protective plastic covering. Passive Backplane systems have approximately the same form factor as desktop systems.