There are a couple of little problems here for the Western companies' "sweatshop hopping".
1. As James 51 has already pointed out, where are they going to go when they run out of said sweatshops? The capacity to avoid keeping ahead of the game by ingenuity and innovation and rely instead on finding yet another cheap country is, in reality, finite.
2. What are they going to do about countries like, of course, China who now have some of their own companies (and they will increase in number) producing ever better kit who can still undercut Western producers because their wage rates although rising are still well under those in the West?
In sum, by only being interested in chasing the bottom line in the short term it is not unlikely that they are now going to find themselves thoroughly out-competed by the new and rising industrial countries.