I was thinking about this question in the age of Amazon digital downloads, and how seldom I go out of my way to physically purchase media anymore. Beyond an occasional Criterion film that excites me (this summer's watch of Shoah, for instance), the last two films I've physically purchased have been A Touch of Sin and Before Midnight, with the latter going all the way back to December/January.
Do you feel the marketplace and/or desire to physically own film decreasing? Has your interest remained steady?