The Seattle-PI asks in the headline of a couple-hundred-word story a question we could answer in one word and a single photo.
The P-I: Have hippie dancers become a dying breed at Bumbershoot?
Answer: No.
Evidence:

Dancing Scarf Guy by Seattlest Flickr Photog smohundro

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i love that man. he was so much fun!
His name is Boe Oddisey.
Of course his name is Boe Oddisey!! Thanks for the tip eleventy!
Another shot here.
He's everywhere... and always in that getup... or so it seems.
Good to see the PI's back to hard investigative journalism.
He was at the South Lake Union Block Party too.
Yay hippies!