If I could add a stage though, it would probably be something like "Cluster 5: Why does my website suck?" Sure it's there, it's up on the WWW, but a website made from someone at Cluster 4 isn't something that is going to make you money.
Cluster 5 is when all the CS comes in. You have to learn about algorithms and data structures and regular expressions and what is actually going on behind the scenes. Yes, you can make a website that does the basic simple "of course, here's an exhaustive search" solution to the given problem. But can you make it fast? Or beautiful? Or, heaven forbid, intuitive? Can you fix it after you try and fail to make it the above three? That's the stage that never ends, the one that doesn't take a week of hunkering down with a textbook to get through.
Cluster 5 is the stage that CS education tries to start everybody at without any prior experience. It works for the imaginative people who can make the leaps about why this matters, but for most it just leaves everyone behind. With web programming, you actually have motivation to learn these weird things about patterns of electrons.
Because, honestly, who wants to make websites that suck?