I can't remember the last time I was in a book store. I certainly don't use them for discovery. I have a small collection of reviewers whom I trust, plus I get good suggestions here and there for other interesting books, and I've now got far more books than I can read in a year. I buy more books now that I have a kindle (curse you, one click!) than I ever did when I bought paper. (I do still purchase paper copies of particularly good books, however. Recent purchases: Captain Vorpatril's Alliance and Mr. Penumbra's 24-hour Bookstore.)
As long as people keep writing books that interest me (and I gotta admit, sparlkey vampires, shape shifters, and most urban fantasy don't), I'll keep buying books.