HI Martin
I wrote a careers focussed blog/rant on this topic. I probably could have analysed it differently for the security space but it was more around skill set. It also only scratches the surface of security skills.
Security is a class of its own
I was also thinking about the smaller/leaner organisation who only have 1 person doing security (or it's the basis or the functional people jumping in and taking a stab at it)
Regards
Colleen