My reaction to the article is that the suggestion that readers take the online test is embedded in the article three or four times in different places. That makes me suspicious. Looking at the test, I think that once you answer all the questions the next step is that it requires you to enter your e-mail address and other particulars and join the website mailing list, otherwise you will not receive the analysis of your test results. I have no evidence of that, I am just guessing as I did not attempt the test.
Aside from that, I think that trying to become a "successful" (professional ?) musician can lead you into more stress and worry than you would have if you did not try and instead were happy with who you were, maybe try to be a little better, but not needing to try to be the best or needing to compete.
Some of the successful entertainers (I include actors, not just musicians) die prematurely by their own hands, despite being successful, Robin Williams being the latest example.
I am glad to say, that as I see it, and perhaps as some others see it, the viola is not a competitive instrument, unlike a violin.
I see that point too... Being a Master of one instrument. I agree with Donald, I didn't like the "test" or links.. seemed a bit to sales-y.
I do think that at the end when it had the chart, maybe it could come in handy for tips on how to "get the job" or promote oneself.
It's all good. Gather up all the perspective you can, and personalize it and see how high you can fly.