Should be easier for FB and Amazon to fill those positions now that Google is not sucking as much air from the atmosphere. I think Google may come to regret its decision for this reason. Part of the reason for these companies to hire is "area denial": the employee is not only hired to do great things, but also to prevent them from doing great things for a competitor. If you stop hiring, you allow a lower-paying competitor like Amazon or Microsoft to scoop up the engineers that would previously be inaccessible to them.