I just read the article. I agree with Diablo it's a good read and eye-opener, however I still agree with Edwin on the competition between new gTLDs and how they'll nullify each other.
Practically any group that can be considered a club will also have their own industry domain anyway.
For example, Blossom, you said a good clientele for .club would be football clubs. But what about .football then? As well as .tennis for tennis clubs, .active and .fit for gym clubs, .academy for sports academies, .college for college clubs, .film for film clubs, .music for music clubs, .golf for golf clubs, the list goes on and on (.football, .rubgy, .nyc, .uk, .com, .fr, .com.au .la, .berlin...)
As Edwin said, 700 new gTLDs all competing against each other is a relatively small demand in comparison to the supply. Not to mention it adds confusion to branding.
I just think people need to realise the full list of domains ahead:
http://www.newgtldsite.com/new-gtld-list/