He's talking largely about web developers who already have a 9 to 5 job:

"Work seems to exist in lots of places; big in-house teams, small in-house teams, agencies, startups and freelancers...I’m a little odd here in having previously worked mainly for agencies followed by a stint of freelancing, and now work for a decent sized in-house team at Global Radio."

Most web developers are professionals - they draw a salary while working for someone else. The folks who're bootstrapping a webstartup while living in their parents' basement are a pretty tiny minority, though perhaps overrepresented here.

Strange then how I have a wife, mortgage and potentially kids on the way soon and I threw the 9 to 5 job out of the window. That to me is growing up! Not buckling down and being a code-monkey for someone who is clueless.