There's a bunch of people saying "why not going out of the Bay?" This doesn't work because for most of the foreign workers with H1B visa job security matters more to them. With H1B visa, you gotta find another job in 60 days when there's a trouble with your employer. Otherwise you'll be kicked out. Also note that Chinese and Indian people are typically stuck at H1B for 5~10 years and they're the majority of SWE H1B holders.

If you're in the Valley (or at least a big city), the solution is pretty simple; take a day off, go to interviews and get a job. You don't have to move out and will have a good chance to get a job relevant to your career. The same thing doesn't apply to most of the other areas. The risk is so high that it can effectively end your career, those people with H1B just tend to pay more for living in the Bay.

So in order to have another big campus out of those big cities, there must be a pre-established, significant SWE ecosystem that can guarantee a level of job opportunity. Unfortunately, this cannot be done by a single company.