> You simply have more chance of career success if you have more skills.
I think that depends on how one intends to apply those skills. Being a generalist means that you don't depend on any one particular skill to always keep you in demand, and you can do more on your own to do tasks that specialists need to do in groups. However, I think a group of specialists will always outperform a lone generalist. Because of that, I imagine specialists are in general more preferable in a company environment.
EDIT: I'm curious if there are people here that have chosen to practice a wide breadth of related skills, as opposed to lasering in to one very specific skill. Do you feel glad/happy about it, or have you regretted it?
EDIT 2: What is a generalist or a specialist is of course very relative. One's specialist is another's generalist. I also get the sense that, in the tech world, what is a specialist today, is a generalist tomorrow. Maybe that's just natural of an expanding industry.