Since you say it's ALL search engine traffic that dried up for you, it sounds to me like your site has a problem. Certainly search traffic is not at the level it was in the good old days for most sites (especially SMBs) but it's still there and still valuable.
Sorry tedster, I misspoke. Not ALL search engine traffic, but way down. My niche is competitive and there's money in it. What I've noticed has more to do with how the search engines have funneled traffic their way simply by placing their ads on top of the organics. I've been able to make up some of the loss using Facebook and Twitter (thankfully!), but not all. Just feels like a land grab.