It's interesting that this was posted on afrobella, she was speaking at the politics of hair symposium at penn a few weeks back and the topic of DIY came up. The tone was similar to the blog post, that bloggers and YTers are a poor substitute for "professionals" and that women are fooling themselves/doing themselves a disservice by listening to "amateurs" on forums, etc.i thought it was a crock of shyte (the proof is in the pudding) but afrobella and some others seemed to be agreeing with them. This post seems like a follow up to that (not sure if the timing fits).
What it comes down to is that as long as one can observe what their hair responds well to, can stick to some sort of regimen and understands pretty basic concepts like moisture, protein and retention, their hair will do fine. As far as styling, one only has to be a good mimic and gain a few basic skills like twisting and braiding (if that). Professionals need to get in where they fit in, which would be providing their services to those who can't do the above for whatever reason (time, etc). They need to be on their a game according to whatever their specialty is - if you're a stylist, there should be no half-stepping, you need to come correct on styling and cutting hair and be up to date on trends. If you're more of a hair care person, you need to strive to be on reniece level and become a trusted partner in helping clients achieve their hair goals, and empower them w/ knowledge and good at-home habits instead of exploiting their ignorance and making them over-dependent.
There's still an opportunity for professionals but this type of antipathy towards DIYing and the online community isn't going to help them realize it.