Suggesting that we are fulfilling the prophesy suggests that the prophesy is real and that the JWs have accurately interpreted it.
I find it odd that they refer to the prophesy of the good news being preached in all the earth, then do a lot of preaching and declare that they have fulfilled the prophesy.
I read about 4 horsemen in the bible so I went out and bought four horses, hired some actors to ride them and reenact the scene from Revelation. Viola! Prophesy fulfilled!!!