The logical contrapositive to A is A' “if something dies off soon, there's a good chance it was a recent fad“. A makes sense, and A' makes equal sense, but B is

The logical contrapositive to A is A' “if something dies off soon, there's a good chance it was a recent fad“. A makes sense, and A' makes equal sense, but B is claiming stuff about new tools for which we have no way of guessing the future.