Well, I don't want to get into a huge debate, because I definitely see the merits of taking attractions from one park and putting them in another. It is relatively inexpensive, and allows people to see the attractions without traveling as far - I get that. But, think about this (and please correct me if I am wrong) - when Epcot, DHS, Animal Kingdom, and DCA opened, how many rides in those parks were duplicates of attractions found at another park? As best as I can remember, only one, and that was Star Tours. I can't think of another.
Granted, all those parks needed more attractions, but instead of developing unique attractions, they began borrowing (poaching, stealing, using - whatever word you want here) from other parks. This is cheap and easy, but I think takes away some from the specialness of each park. It seems lately, there is a lot of this borrowing going on, and while on one hand, it is great as it adds the number of attractions, on the other hand, I think it takes away from the uniqueness of the parks. I think this is lazy (or cheap).
So, for Carlsand, my selfish side definitely wants to see it at DHS, as I live in Virginia and go to WDW much more than DLR/DCA, and the BLT could sure use a replacement, but my other side thinks it should be a DCA only attraction and DHS should have its own unique and amazing attraction. I see both sides (heck, I want both sides), but I still think it is a bit of laziness (or cheapness, I also now accept that term).