Carl Jonsson makes some good points in his book "Sign of the Last Days -When?" He examines the "signs" in Matt 24 and Luke 21 and actually shows that Jesus was warning people DO NOT BE FOOLED BY THESE THINGS -THE END IS NOT YET. The actual sign Jesus mentioned in Matt 24 v 3 Jesus doesn't start to explain until he describes the SIGN OF THE SON OF MAN in the heavens.
Just another school of thought.