I have a Kindle, and I've bought maybe 200 books for it in the two years that I've had it. As much as I love it, I still buy more books at the store than on the Kindle. I usually managed to spend at least $150 at Borders every month. This will likely change once the store closes, and part of that was spent in the cafe, but the majority on hardbacks that I just don't buy in ebook, or in addition to the ebook.
Main reason I have my Kindle is for traveling, reading during lunch, and because buying books takes up way too much space. Which hasn't stopped me from buying the books, just made me buy them at a slower pace, at least until my Borders was put on the closing list.
Ebooks might very well be where publishing is headed, but it's going slowly. Right now, physical books still sell more than digital.