you can get the same effect on salary by making it easier for a H1B recipient to leave the company that brought them over. Right now its very hard for a visa recipient to move companies so they can be given sub market rate salaries, if you make it so once they show up they can move to get a market rate salary then the companies who make a pratice of hiring foreign talent and paying them below market rates will end. The companies will incur all the cost of bringing in an H1B and some other company can just pay them more and receive the benefit.
This also addresses the concerns about salary differences between different industries and regions.
This also addresses the concerns about salary differences between different industries and regions.