Sometimes it just so happens that what others do benefits us, and then we never think of controlling their business. Instead we'd say "oh just keep doing what you're doing". In a sense, Google has been doing a lot of that. With its search engine, and adsense, it allowed a huge amount of individuals to start making money online, and even make a living. While we could rely on multiple search engines for traffic, the obvious fact is you get your traffic from Google. So you sometimes get the positive, sometimes negative. Neither is a good reason to start trying to control them. Adaptation is the key.
What happened is that Google is simply providing you with less, but it is still doing it, because it is in some part in business of doing that, but was never and never will be, obliged of sending you traffic. You simply took advantage of something Google offered, and built your business around that, and now that has changed and you're forced to adapt.