Thing is, Art isn't only about something that promotes discussion, that's the whole point. Constable or DaVinci's most famous peices were not politcally minded, they were studies in the technique of art, of how to get something looking as realistic as possible etc. Photography killed that skill to a certain degree.
I'm fine with art that promotes discussion in it's own way, but if you push something too far down the 'something to promote debate' road, then how is that any better than pushing it too far down the 'Something nice to look at' road?
The fact is, I don't enjoy modern art any more, it's boring, overdone and, for something that is 'modern', getting somewhat long in the tooth. Unmade beds, a piece of blue canvas, a screwed up ball of paper. Minimalism gone mad really.