Nice article. This one he linked to at the end is really good too:
As someone who's gone through multiple careers in various industries and creative disciplines (art, music, writing, photography, directing, video games, comic books, animation, teaching, and a bunch of non-creative jobs), I think a good dose of pragmatism should be required. Also, in most cases, until you've actually dedicated a lot of time and energy to a specific endeavor or career path, you will not know if it will "love you back," or that your personality/aptitude is really suited for it.
In my own life, there were things that were outside of my control that made me alter my path several times (such as our society's devaluing of music since the Internet became popular, or the crash of the comic book industry in the late 90's), or things I couldn't have known until I've experience it (such as how devastating it is to have funding pulled away by investors, or losing valuable talents on the team, or being told by someone who knows absolutely nothing about music how you should create music for his project, even when his ideas are absolutely terrible both musically and narratively), or learning about myself and what really suits me (dislike of physical aspects of certain creative endeavors, such as how exhausting certain types of photography can be--getting up before the sun is even out, climbing onto dangerous spots, hauling heavy equipment, dealing with the weather, etc). It took me many years of working hard at excelling in specific creative endeavors and working in different industries to finally figure out what really suits me and makes me happy.
I think the best advice I can give someone who is passionate about any creative endeavor and aspires to do it professionally, is this:
Only go down that path if it is something you will continue to do passionately even if you won the lottery and become filthy rich, or if you never become good enough to break into the industry, or you do break in but could never make a decent living at it. If any of those factors would result in you stop doing the thing you're supposed to be very passionate about, then you might want to take a long hard look at what your real motivations are, and ask yourself if you really truly love what you do.
The fact is, there are plenty of people in this world who are willing to spend a lot of time and money on their hobbies (surfing, playing video games, photography, making dolls, box-cart racing, cooking), and they don't ever expect to become a pro and make a living at it. For them, they do it for the love, and even if they never make a dime at it or become good enough to reach professional levels, they continue to do it because it brings them joy. If that is how you feel about your creative passion, then I think that is the ideal, because to you, making a living at it is just the icing on the cake, not the cake itself. And when you love what you do at that level, nothing can stop you, because rich or poor, busy or idle, you will continue to want to do the thing you love.
One more thing to mention, is that sometimes, turning what you love into a career can end in tragedy, because the business end of things can often end up destroying the purity of the love you once felt. There are people who stopped doing what they love as a job because they experienced that pain and realized they'd be much happier keeping their love as a hobby, instead of letting the business demands ruin everything. Most people when dreaming about doing what they love for a living, they aren't thinking about the infuriating aspects that come with the job such as chasing down payments, dealing with unreasonable clients, being told what to do by people who don't have a clue and won't listen to you, dealing with inner-group politics, cutthroat competition in the industry, bad press, worrying about funding and manpower, having to compromise your creative vision and dumb down something to better sell to the lowest common denominator, and so on.
If you have a dream and are working towards making that dream come true, don't just have your head in the clouds--you need to take some time and really think about what you want and what is in store for you in a pragmatic manner. Life very rarely turns out as we imagine it would.