I think it still matters to Blu Ray only folks. They STILL don't have any idea when they'll get the Uni and Para/Dreamworks movies. Remember, they didn't gain any movies with the Warner announcement, similar to how we didn't really gain any movies with the Para deal. So, while HD DVD-only people miss out on Warner movies after May, Blu only owners don't really have anything new.
Until the inevitable Uni and Para/Dreamworks announcement, Blu only folks still have to wonder when they'll get those movies. It's why I haven't sold my add-on. I have no idea when most of the movies I own will be released on Blu, and I already have them, so why sell them off if I don't know when I'll be able to own them again?