I've heard it said that the gospel needs to be preached to all nations and peoples first. In addition Paul talks about the Jews being cut off from the vine until the full measure of gentiles is brought in. Paul expected that the Jews would eventually be saved.
Another thing to consider is that if Jesus had returned a 1000 years ago would we even exist? Will new humans be produced after the general resurrection? Thus, it is not for us to determine the dates and times since we are not God and it is His plan that will be executed in His timing.
People assume when things get worse Jesus is coming soon. But history tells another story. Think about the Black Plague in the middle ages. People were dying so much.that bodies were piling up in the streets. You can not get much worse then that. Many thought it was end times then.
"The Lord does not delay his promise, as some regard "delay," but he is patient with you, not wishing that any should perish but that all should come to repentance. 10 But the day of the Lord will come like a thief, and then the heavens will pass away with a mighty roar and the elements will be dissolved by fire, and the earth and everything done on it will be found out." (2 Pt 2:9-10)