I agree that it would be a very good idea but I do think it's much harder than you think... purely because shareholders demand constant growth and so if a company has 20% of its market in the US, any CEO that suggests dropping revenue by 20% won't last long enough to have that 20% replaced by other countries.
Private companies have a much better chance, but I still imagine it'd be hard for them to step away from the US market and allow their competitors to pick up the slack.
Unfortunately, as with everything, capitalism ruins this fantastic idea.