All in all, its pretty insightful take a peep at the the full interview by just a (click)
Like the idea of 'vintage', the fashion collaboration was something quite novel and small-scale when it evolved in Tokyo in the 1990s. But also, like vintage, it's ubiquitous in the industry at all levels now.
I'm definitely very over it and quite bored of the whole idea of collaboration as a means of doing something creative. You may be right to point out that Harajuku was where that started, as a kind of marketing tool I guess, but it wasn't thought of like that then. There was something genuine about it and it was usually on a very small level between real friends, who just happened to be doing things on different brands and found it fun to work together. Then big companies started to get involved, and then it would end up just as two big companies combining. It becomes quite boring.