I go into adult 'bookstores' (do they still call them that? Geez, I feel old) about once every year or so. Usually it's out of boredom and not necessity. I might buy something while I'm there, but I really only go in for the 'Oh look, let's check out what they've got' sorta thing. Most of them still have DVDs.
When was the last time I was in a store that primarily sold DVDs? About the last time I bought one. Nearly 9 or 10 years ago. Ever since, the internet has replaced them.