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Blockbuster can't support both because they can not afford to do so. Blockbuster has been on very rocky financial ground since being spun off from Viacom. The rental market is not nearly as big as it use to be, because DVD is so cheap a lot of people buy movies as it seems like a better value.
As of right now HD-DVD stand alone players are far out selling their Blu-Ray counterparts, but Blu-Ray media is doing fairly well because of the PS3 (though soon its market will be nothing but a extremely small addition) in total units that can play Blu-Ray movies. The "war" is far from over, even once one kills the other, they have to fight DVD which is going to take a very long time. A lot of time people don't notice a large enough difference in quality to justify a new TV, new HD service, and new format player.
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