Well, yes and no. Sure, you can get hit with an algorithm change or penalty that destroys all your traffic. However, if you have good people who know what they are doing, this is not likely to happen, and if it does, it is easy (in most cases) to get your visits back. Panda and Penguin are another story, but if you get hit by those it is typically not accidental.
Hey Roezer, thanks so much for the comment. I have to explain my links, lol. I think you can see I didn't use many and most of them were actually attached cause I forgot to uncheck the ComLuv box. However, for example, in the reply at the very bottom of the page, I replied to Ben from EpicLaunch telling him about the list I included him in, and attached the link so he can see it if he was interested. The SEO 101 link I have included is, what I think a great post I posted last week and I thought people might like to read it. So several links I did attach on purpose, were there for a reason. Again, as I said, there were few attached that I forgot to uncheck, mostly that I had log in problems time or two. I always do something like that with my guest posts and try to avoid using ComLuv a lot, because I don't feel I am entitled in so many links, just like to play fair. But, when it comes to titles you mention, if you want a Com Luv link click, your title has to be great. I am practicing and I can see that practice makes perfect. Although I am far from being the master of titles, I get way more clicks now than I have when I first started blogging.
Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources: