If it was just my wife and I like it has been, I wouldn't mind the risk. We've gotten this far. My fear is in hiring a new employee and having their livelihood dependent on my business that has a single point of failure. Granted, it's a fairly entry level customer service position so it's not like someone's going to retire from the job, but I would still feel just awful if I had to let them go because we had no traffic due to something like a "mysterious" Google penalty that I can't figure out and will get no help from Google on.
I'm hoping we can use the free time we'll have from mundane tasks to think about how to make the business work with other traffic sources.