Yeah, I'm concerned about the SMB myself. A bummer for them, for sure.
I think that SMB's in particular need to think about an influencer strategy that involves identifying their most likely and best customers and/or an owned media campaign (and this may be in-store if you're a brick and mortar) to engage folks. Example: Betabrand in San Francisco (a hipster clothing store making jackets out of disco ball material and such) has a dummy in the store wearing a smoking jacket, and you can pose with that dummy on-the-spot and get 10% off your puchase right there, and they upload that pic to their FB page and tweet it to you. This is the sort of "work with what you have" tactic that'll need to be adopted - and truthfully, this is the sort of quality of interaction that means a lot more than impression numbers in the first place. Engagement is why Reach is important; this is what we're after, especially on a social media channel.
Don't get me wrong: I was, of course, disappointed to see something that we've gotten for free - and something that has been positioned by FB as the reason we were all working to build up audiences - suddenly become a channel that requires a considered spend. But, it is what it is: so, let's refocus our tactics and see if we might just get better at this out of necessity. ;)