[msb]

I hardly think that because one friends passion turned into a career that wasn't recession proof constitutes enough evidence to say we should give up on following our dreams. I know plenty of people who pursued the 'big problem' and have had successful careers, yet remain unfulfilled because they don't have a passion for their work.

I like the idea of finding the problems to solve, but I don't think this has to mean we leave our true passions behind. Life is short, pursue your passion. When you hit a wall use the knowledge and experience you have gained to solve problems within the field you are passionate about.