The article ties one's dreams to his job. To some extent it's a valid link because work is so much of our lives. But as far as I'm concerned a job is just a tool, a (rather painful) way to obtain freedom; the wealth I create while working allows me to do whatever I want in my free time (I'd rather have just the wealth than the job). I prefer clearly separating my work life and my fun life instead of living for my job. The non-work part is much easier: if I want to become a robotics engineer for a month, I can buy parts and play with them until I get bored (and want to become a musician for a month). If I want to become a professional robotics engineer, it's a very different story! (I chose this example while thinking of Anybots: now that Trevor has the wealth, I'm pretty sure he's building robots for pure fun only; if he decided early, right after graduation, to start a career in robotics he would probably be designing boring industrial robots for some corporation).
"I prefer clearly separating my work life and my fun life instead of living for my job"
That's likely because your job is not fun. If you were more invested in it (e.g., it fulfilled your dreams), you might feel differently.
Thinking that work doesn't have to be fun is what leads most people to dissatisfaction, IMO. I think the idea that your job should be a vehicle for fulfillment is a very important one. Time is scarce resource, and it is a shame that many people are willing to trade the bulk of their lives away helping someone else achieve his dreams rather than trying to achieve their own.
It occurs to me that the most liberating and frightening aspect of entrepreneurship is its lack of definition compared to traditional employment. Consider that a traditional employment relationship leaves the average employee little time for introspection, and it's easy to see that he's been trained to dream small and settle for the scraps of time he hasn't traded to his employer for a relatively small amount of money.