>"Can art change the world?"
People, even those who should have an ostensibly "humanistic" outlook, have largely forgotten the possibility of any activity that is not subordinated to utilitarian concerns. The fact that this question was asked in the first place betrays a certain level of insecurity and even guilt over the way one chooses to spend one's time. It is not asked out of idle curiosity, it is not an honest question that will follow the arguments where they lead, rather it is a question for which an affirmative answer must be manufactured if one is not forthcoming.
Healthier questions include "how can we change the world so there is more time for art?", "why doesn't everyone understand how great art is?", etc.