Many page owners think that organic reach (the number of unique individuals who see your post pop up in their news feeds) is enough to make an impact. This was true in the first few years of Facebook but is no longer the case. Facebook, and many other social media networks is truly a pay-to-play network. Facebook, Twitter, Instagram, and LinkedIn are all on algorithmic feeds, meaning posts are shown to the user based on past behavior and preferences instead of in chronological order. Organic posts from your Facebook page only reach about 2% of your followers, and that number is dropping. Facebook recently announced that, in order to correct a past metrics error, it is changing the way it reports viewable impressions, and organic reach will be 20% lower on average when this change takes effect.
So for the last 19 years or 20 years that Google has been around, every month Google has had, at least seasonally adjusted, not just more searches, but they've sent more organic traffic than they did that month last year. So this has been on a steady incline. There's always been more opportunity in Google search until recently, and that is because of a bunch of moves, not that Google is losing market share, not that they're receiving fewer searches, but that they are doing things that makes SEO a lot harder.
Although it may have changed slightly since BrightEdge published its report last year, the data still seem to hold true. Organic is simply better for delivering relevant traffic. The only channel that performs better in some capacities is paid search ads, but that is only for conversions, not overall traffic delivery (Paid Search only accounted for 10 percent of overall total traffic).