When Toyota US HQ moved from CA to Plano, Texas, there were rumors that part of the reason was to purge out employees with low/no energy, initiative, output, etc. Employee with no output at work will most likely not bother with the whole enchilada involved in relocating to another state.

Apparently the US HQs of Japanese motor companies follow Japanese corporate model and do not lay off employees. So they end up with quite a bit of low performing employees. Just rumors I heard.