^ How much would it cost Paramount to include the originals, if they just put them at standard definition and didn't even bother with upconverting? Virtually nothing. And there are many "purists" out there who would want the originals in their Blu-ray collections. So I think it could have economic value to Paramount.
They would probably have to include more discs, and since I don't know how much it costs to make a Blu-Ray disc/set, I can't comment on whether that would be the major stumbling block. However, with Blu-Ray sales not looking good all round, I doubt they'd do something like that if it would cut into their profit margins.