I have not been around that much to notice the two camps that the author is talking about but I can see the points.

Where I have been for the last two years, we use sql a lot and .net a lot. We use each platform where we think it is best and we do not really have any sides of sql peeps or .net peeps. Most here does both sql jobs and .net jobs at the same time and everyone has some responsibility areas. Then we have network admins etc responsible for the hardware.