Blade Runner 2 was very cool but in 50 years time people won't give a fuck about it and talk about the original almost exclusively. Same with Prometheus and this new Star Wars Trilogy. These are all homajes to the greatness that where the originals. They are born of sheer fan rapture whereas the originals where made by intrepid, inspired folk who where set upon pushing the boundaries.
All these sequels and what have you, on the other hand, are little more than entertainment. Blade Runner 2 is fantastic in its own right, but I hesitate to accept it as a legit sequel.