Not to worry, they will just make it illegal to move out...

States Recruit Worried Californians:

"States have been vying to lure businesses from one another for decades, and California has often made a tempting target. But John Boyd, a corporate relocation consultant based in Princeton, N.J., says he senses a new eagerness among his California clients to look for greener pastures.

'The tilt of corporate investment out of California is accelerating,' he said."