Ford, the company, along with GM gave up that system half a century later for a more rigid system that included more outsourcing but had the upside of being impermeable to strikes. Toyota on the other hand continued the flexible system along with the higher cost of labor and royally outsmarted the American companies in the 70s.
The role of organized labor shouldn't be ignored. And neither should the competitve advantage of working with well-skilled and well-contented labor.