I stream a lot of movies (via Netflix, Hulu Plus, Crackle, Amazon). I have rented from Redbox for years but I don't have to as often now. Since there is a time frame that they have to wait to rent them many direct to DVD movies make it onto Netflix at the same time.
I still buy DVDs too though. I like being able to do both. The fact is that sometimes my internet drops out or is just streaming too slow (for instance during peak usage times, late at night or on the weekends or holidays) so that's when I pop in a favorite DVD. I've almost always bought movies that I already know that I love though. I'm not much of a blind buyer.