They really need to go back? They have been pushing that rubbish since 1872, so certain that it would come in 1874. And that was only the latest in the series of similar predictions dating back to the 1830s. Then when 1874 went bust, they were so sure it was coming in 1914--another bust. After that flop, they were dead sure that 1925 was it, then 1941. Then they urged people to sell out and pious-sneer between 1967 and 1975, because the end was coming for sure by October 1975. Not only did November 1975 come, but so did 1976--and when 1976 came, they blamed the witlesses for taking it so seriously after themselves hounding them to sell out and pious-sneer.
I personally believe that there will be no God-inspired spiritual awakening, Rapture, or judgment day coming any time soon (if at all). If anything drastic happens, it will be because Rick Perry gets "dragged" back into the presidential race (I believe his dropping out was about as sincere as Osama Obama's threat to veto NDAA was). I believe it will be through man's efforts culminating in mass human enslavement and not God's judgment that will ultimately cause doom for mankind (doom, that is, to drudgery replacing joy, and all happiness being stripped out of the human race). I also believe that there is nothing to be gained by reading the Bible--yes, you might be able to defer your dose of problems up to the point where the enslavement itself begins by procuring for yourselves silver and gold, and learning to rely on yourself. But no religious group is going to prepare you or prevent you from entering this enslavement--or offer anything better after you die.
And much less going back to wasting your time peddling littera-trash. That is the worst thing you can do--you are learning nothing useful that can help you in a crisis, you are wasting resources on field circus and boasting session attendance, and you are learning nothing but rubbish.