And yes, anyone expecting any kind of job security at a startup, especially a VC backed one, is simply fooling himself.
If you're developing an innovative product for the iPhone market, you can be sure that it won't be "innovative" in a year, especially if it was a good idea to begin with. Not to mention that in a year, such a fast market will move so far, that your original business model will be outdated in significant ways, because your price point, features, and target audience analysis are now all obsolete.
Even without that, though - you realize that VC-backed startups are a huge chunk of the startup sphere? In fact, the author of this article is a VC, and probably most of this article was written with VC-backed startups in mind.