From what I see on store's shelves, I would say not in forseeable future.

The same subject was discussed couple of years ago here in AR that DVD is on way out since store don't want to stock double inventory of bluray and DVD discs, or DVD like VHS will fall on way side. But I don't see that happening as fast as we thought it would. There are still movies coming out on dvds, including alot of TV shows that are not available on bluray.

Past TV shows seem to be main stay of DVDs and since most of them are in SD (standard definition), studio don't see benefit of releasing them on bluray. So I am assuming both DVD and bluray format may exist side by side for a while.