Asynchronous communication across timezones has not been solved, and I struggle to see how it would be. A lot of collaboration requires a conversation and instant feedback from another party. You can't collaborate like this when there is a delay of 8 hours instead of 8 seconds between responses.
So "anywhere" is a bit of a stretch. That being said, absolutely this will happen across the United States. There is nothing that makes developers in San Francisco more talented than their counterparts living in Tennessee, so if those can be gotten cheaper, I can see how the overall price would go down.
Presumably though, such an effect would also cause rents and property values to go down in big cities. I can see how the natural evolution of such an idea is that wealth will be more evenly spread out throughout the country, instead of being concentrated in cities.
I still think the Facebooks and Googles will pay a lot more - someone has to be the "top dog" attracting the top talent. The question is, how much more?