I don't think they are going to need it, because the actual problem is going to be the opposite; this will drive down developer salaries. Having to be local to Silicon Valley really limited the supply of good developers; only so many people can physically live in the area, so increased demand can't be met with increased supply indefinitely. This drives prices up. If everyone is remote, suddenly the supply of available developers goes way up for these firms. The supply of developers available to them goes way up. Sure, they have to compete with firms everywhere in the world now, but that is fine for them; the global market is not nearly as strong a seller's market for developers as it is in Silicon Valley.
