So, is Deckard a replicant?
And also cheapens the plot and the questions it poses by a lot, a lot. The movie leaves you with more after watching it if he isn't, or if it's just ambiguous.
Well, besides that you know, the obvious implications for the rights of intelligent beings, natural or not, but since we won't have strong AI for a while and it wasn't about animal rights no matter how much you stretch it, we're left with questions about our own nature and how we relate to other humans.