Why? At the high-end, it is already an international market for talent. Where visas are hard to come by, the choice is not often to increase salaries to hire more Americans, but where should we open that new office: Berlin, Bangalore, Singapore, or Beijing? Couple that with a horrible American tax policy that makes repatriating income earned abroad expensive, and doing R&D outside of the US is quite appealing (not only can you find more talent, but you don't have to bring money back to the US to pay for that talent).