I think that the real reas
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I think that the real reason that these new formats are coming is that DVD sales growth is falling off and the studios want everyone to buy another copy of their favorite movies.
The main problem, though, is that both main HD formats are supposed to be backwards compatible with DVD, so the only reason you would ever want the format for movies would be if they start releasing hi-def" versions (which will eventually happen, no doubt). But honestly, except for my very favorite movies, like "It’s a Wonderful Life" for example, I have rarely bought a DVD version of something I have in VHS. If I really want to save it on DVD, I dump the video onto my computer and burn the movie onto a DVD-R
Besides, in full true HD format, a DVD just can’t hold enough video to be useful for long, wheras new technologies will be useful into the adulthood of HD, depending on which format survives.