I wonder how that's destroying their name. And the audience really enjoys it - it's fun to try to strike poses for Brian, and it's even more fun to later on try to spot yourself on his vídeos. Brian has found a simple way to give many people better memories of the concert than 200 pics they could try to take with their phones, and also a way to share a laugh with his fans for a couple of minutes during the concert.
I guess it isn't as fun for bitter so called "fans" who miss the concerts and stay at home bashing the band while others are near the Doc, though.
"In those days, people went to a rock show to listen – and to jump about and scream and shout, but not to sing every word like they do now. And there's nobody with mobile phones in the audience, nobody doing selfies – how weird is that?" link
...says the guy with his ridiculous selfie stick on stage