There's been quite a bit of buzz about Facebook's tweaks to EdgeRank. Are less people seeing your content? Is it all just a big scheme to get more ad dollars? Should your company jump ship to Google + where it is safe? While we may never know the answers to all of our pressing Facebook questions, I can tell you this...If you do the basics you'll be able to ride out any EdgeRank craziness.
Think of it in terms of weight loss, if you want to lose weight eat less calories and stay active. I know it sounds waaaay too simple, but I've seen it work. When it comes to Facebook you also need to do the basics to stay in the game - post regularly, post engaging content, interact with fans and buy advertising from time to time to get fans re-engaged or to draw in new fans.
In the meantime, Facebook will fumble, tweak and hopefully come up with a solution that makes both fans and brands happy. Your role as a page owner is to do the best you can to ride it out and keep fans engaged.