Possibly true, but what if employees had the additional flexibility that being tied down to their homes prevented? I think you are confusing this effect with a more general bias towards mobility relative to other countries.

The most recent housing market collapse has made America much slower at readjusting to restructuring of the economy--for example, workers in Florida can't easily sell off their homes to move to a different location with greater job density, for instance. I'd like to see more data supporting your assertion.