Blu Ray goes up a ton every time there is a big action movie release. In fact in many cases the Blu Ray version seems to do either about the same or better then the DVD version. Iron Man is a great example of this, Dark Knight will be as well (and Transformers would have been if they were released at the same time).
Really big budget action movies are the ones worth getting on Blu Ray most of all. Sure its nice to have some extra features or better picture quality on a Drama or a Comedy, but action blockbusters are where the attention to detail and sound really shine with Blu Ray.
If you are looking at ALL movies, Blu Ray will take a while to overtake DVD, but in terms of big budget event movies I bet from early 09 at the latest and on Blu Ray will outsell DVD if it doesn't already. As to Blu Ray selling the most OVERALL it may take longer, but it certainly is worth the time even now.
I know I would never have bought Iron Man on DVD. With DVDs I just started buying them a few months after release for 5-10 dollars at Blockbuster (used). They were just a commodity item with low percieved value. Blu Rays, starting with Casino Royale (the first REALLY great Blu Ray movie) have become a 1st week purchase for me on action movies I really like.
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