We already have those laws in many states...And still, American industry has been and IS still leaving for China from those states...Nice try though...
If so, certainly not as fast. I've worked in both open shop and union states and the difference on the shop floor in productivity is incredible. These states (predominately in the south but not all) are the ones garnering the most of foreign investment in this country. Those investors aren't stupid.
BTW Toyodas and Hondas don't cost anymore to build in this country. They sell for more because the consumer perceives more value. The UAW will kill off the entire American auto industry.