Someone comes along and makes a perfectly acceptable movie. Let's say it's called, oh, I don't know... John Matrix. It's probably even a good movie. It has a decent plot, competent directing, a few stars giving a good performance, and it manages a good box office. Yay! It's a hit.
Overall the feel is like that of Ocean's Eleven; everyone seems to be having a great time making an enjoyable film without too many pretensions. We all know that it's ridiculous, but it's a heck of a lot of fun nevertheless.
It's worth noting too that this film's primary question is not "are replicants people too?", but rather "how and why do people refuse to recognize them as such"? That Roy and his companions are human should be beyond debate. Why then does society refuse to accept this? Beware! Follow those answers too assiduously and you my find they have uncomfortable implications. As a result, however, even should technological progress make the setting seem quaint someday, I think Blade Runner will always feel relevant because its themes are so...human.
What seems simple on the surface turns out to be less so, since as soon as Marlowe starts digging into the tale of blackmail people start turning up dead in his path and the mystery deepens and broadens to encompass a lot more than just a few gambling debts.