A recent Andres Serrano exhibit in New York had photos of a woman masturbating a horse, fisting, and other lovely themes. I don't feel that way, personally. I still get shook up. I don't need to see a woman masturbating a horse to get really shook up. It might not shake me up at all.
Genuine art is what lasts.
Something people genuinely respond to fairly regularly. Maybe a lot of people don't respond to it initially, but after five or ten years people still keep coming back to talk about it and appreciate it in different ways. I think that's probably a safe bet about what constitutes something that will endure. It endures without advertising itself. I had a teacher once who was teaching us some classics, and he assumed we'd all be bored to death.