My lovely and dear Gaia has written a few words about this incident:
Although I don't agree with his opinion on Banksy's actions (me, being a somewhat traditional gal), I do understand what this means and what could come of it. But I wonder, Gaia. Is this piece breaking an "insecurity" in graffiti? ".. a new gesture that is unafraid of ramification or change."
I think heirarchy is important. I think tradition is important. I think change is important. Whether or not I believe Banksy this one out that much is questionable. Whether or not I believe he was trying to be "controversial" rather than revolutionary is questionable.
Read Gaia's response at Juxtapoz.