Let me clarify one thing from the outset: I believe in biblical prophecy, and I believe that every prophecy in Scripture that has not yet been fulfilled will come to pass under God's direction. I even believe in the present-day gift of prophecy, when God wants to give a specific word of warning or instruction to His people, to bring them back into alignment with what the Bible sets forth (note that the Old Testament prophets didn't spend most of their time predicting the future, but rather calling Israel to account for their breaches of the covenant God had established with them).
But I also want to make sure that when we talk about prophecy being fulfilled, we're talking about actual biblical prophecy, and not the vague, generalized prognostications of contemporary pretenders to the prophetic office, or the writings of popular end-times authors whose ideas are more the result of speculative attempts to connect the dots of Scripture than they are actual articulations of what the prophets of old wrote under the inspiration of the Holy Spirit.