I think you are missing the most important reason.
3. Consumers do not value streaming like they value physical media such as DVDs. Because of this the rights holders wish to maximise profit and will not discount to satisfy the masses. Instead they will litigate and develop new formats to make streaming less viable (hello blu-ray).
Until rights holder can see a non-cannibalistic and as-profitable distribution network with streaming they'll stick with the gravy train of physical media.
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I think you are missing the most important reason.
3. Consumers do not value streaming like they value physical media such as DVDs. Because of this the rights holders wish to maximise profit and will not discount to satisfy the masses. Instead they will litigate and develop new formats to make streaming less viable (hello blu-ray).
Until rights holder can see a non-cannibalistic and as-profitable distribution network with streaming they'll stick with the gravy train of physical media.