If you depend on current trends for you thinking, you'll never predict the future.
Yes you will, and quite well. You'll miss the fundamental shifts though, but there is no way to predict them anyway.
> If you depend on current trends for you thinking, you'll never predict the future.
is itself an observation about current trends in the efficacy of predicting the future, and therefore, if it's true, must be false.
The statement could still be wrong, but not for the reason you cite.