Here is a very interesting article from 2007:
The Cross-Discipline Design Imperative which examines the conventional design workforce and how it will or should evolve... In essence, "those who can marry creative right-brain thinking and analytical left-brain thinking are at a premium...".
Over the last decade, website design created a big demand for cross-discipline design. Web developers and graphic designers have to understand marketing goals while marketers have to understand what is feasible and what is not. But over time, titles like webmasters have disappeared. Web developers and web designers still exist but their job requirements are no longer exclusive. In the past 5 years or so, newer job titles like Information Architect (IA), User-experience designer (UX) start to appear. This is due to yet another wave, an increasing demand for web applications. Software engineers are pulled into the game. Since most of the design workforce are not really trained in a cross-discipline curriculum, the user-centered design methodology has been widely adopted and has proven capable of holding a cross-functional team together. Personas are difficult to design but easy to understand and share.
One way to get a feel of the job market is to do a search on certain job titles or check out career pages of corporate websites. Not only will these reveal what a company is doing or where it is heading, these also provide valuable information on new tools and skill-sets required for certain jobs. A great way for someone to plan a career path!