...course I am commenting from the view of someone who believes the Bible...(like I have to tell you! The reason I preface my comments is that I don't want to argue the fact that I have faith, just giving you another point of view)
If you get into fulfilled prophecy in the Bible, you will notice a lot of it was written so that when things came to pass, the reader would recognize it. There are some very compelling and specific prophecys which give the basis for people who now look to the Bible. However, if a prophecy is made, or interpreted by someone or an organization and it does not come to pass as it was prophesied, the scripture VERY plainly tells us to, at the very least, disregard them. They are false. That is a fact about the witnesses that is so glaring that those of us who have left can't believe those who stay won't see it.
That being said, the prophecys about end times were written firstly for the end of Jerusalem, and also for the return of Jesus. They are still valid. As humans become more advanced technologically, them seem to be deteriorating morally and spiritually. Most people want to believe we are advancing in every way. The more money and free time humans have, the more degraded and selfish they become.(We can discuss this on another thread)
Really the bottom line for a believer is, it doesn't matter if it happens in our lifetime or not, it doesn't change a thing. If your relationship with God is right, you have peace inside, and freedom from fear of death,which is one of things Jesus came to accomplish. He never told us to not marry (we are warned against those who teach that actually) or sell everything and go on our housetops to wait for him. He expects us to be busy about what he left us here for.
Of course none of this means anything to someone who thinks it's all bogus, so that would be your first step to decide whether you believe or not. If not, what do you care?