Google is already an extremely large company, and I think that many are only just now realizing the problems that they were contributing to. It may take a while for employee actions (both protests and resignations) to have a visible impact due to it's size, but I think they're making progress.
As per my thoughts I expounded here: https://news.ycombinator.com/item?id=19548485 I think that Google's available talent pool is shrinking. Many very talented engineers have left, and many new potential engineers would not want to work there. Sure, there are still plenty who do, but I would say their options are narrowing over time.