Can they all be wrong?

It seems that every known economist is predicting an end to the US Dollar as we know it.  Can they all be wrong?  I personally think that we need to take their warnings seriously.The average life of any fiat currency is approximately 40 years.  We went off the gold standard in 1971 and it is now 2014...43 years...and things are quickly getting worse.  Are you paying attention?  Will you have any real currency if the dollar becomes worthless?  Are you preparing yourself and your family for the rough times that may happen sooner than you think is possible?  Do yourself a favor and educate yourself.  Make an informed decision on what you need to do.