»In which graffiti jumps the shark

Street art has been on the cusp of mainstream media recognition for some time now.

(can't fool me: that picture is from Barcelona. Note the distinctive street sign, the BCNeta bin, and the two grinning fish from Pez. Barca has glorious street art: I suspect that city, not subway taggers in New York, is what sparked my love of graf.).
And I ask myself: hath ye shark been jumped? The rhetorical answer is, "Whatever. So long as people continue tagging and pasting-up and acid-splashing, and as long as fancy hair salons contract street artists to decorate their windows, then all is good in God's world."