" This gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come." Matthew 24:14
I don't see this as a timing or prediction thing, but primarily a mission statement.
EG: In Acts 1 Jesus said:
7 He said to them: “
It is not for you to know the times or dates the Father has set by his own authority. 8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”
What happens throughout Acts? They do precisely that - they go to Jerusalem, Judea, Samaria, and to the ends of the (known then) earth. Basically by the time the gospel reached Rome, it was pretty much 'mission accomplished.'
In Colossians 1 Paul says " In the same way, the gospel is bearing fruit and
growing throughout the whole world."
Also, Matthew 24 is very complex. It switches between when "These things" that are going to be destroyed in that generation, which is THAT temple they can see before their very eyes. Not a hypothetical temple to be built in thousands of years. THAT temple - the very one the disciples were wondering and asking about.
But it's confusing, because it jumps back and forth between "These things" (that they can see) and "That day" (when the Lord returns).
In this passage and others, Jesus warns them that around the end of the temple there will be trouble - such as earthquakes, wars, and false Messiahs. False Messiahs stirred up the Jews and led revolts, which is precisely what brought the might of Rome against Jerusalem and ultimately destroyed the temple! So no wonder Jesus warned them against going out 'into the desert' to chase after these military types - spreading the gospel and giving the church a chance was vastly more important.
There's also a compare and contrast going on here.
"These things" - the destruction of the temple = predictable, local, so avoidable.
"That Day" - the Return of Jesus and end of this world = unpredictable, universal, and unavoidable. So don't fall for false imitations of the real thing! It's the end of the temple - but not the end of the world - even if it feels like it!
So does the gospel go out before the end of the world, or the end of the temple?
4 And this gospel of the kingdom will be preached in the
whole world as a testimony to all nations, and then the end will come. 15 “So
when you see standing in the holy place ‘the abomination that causes desolation,’ spoken of through the prophet Daniel—let the reader understand— 16
then let those who are in Judea flee to the mountains. 17 Let no one on the housetop go down to take anything out of the house. 18 Let no one in the field go back to get their cloak. 19 How dreadful it will be in those days for
pregnant women and nursing mothers! 20 Pray that
your flight will not take place in winter or on the Sabbath. 21 For then there will be great distress, unequaled from the beginning of the world until now—and never to be equaled again.
This is typical Jewish hyperbole - but maybe to them the end of the temple would have felt like the worst thing that had ever happened. But here's the bottom line. It's not the end of the world because it is predictable, local, and avoidable. You can escape it. When the Romans come, RUN! But it's hard if you're pregnant or nursing. The fall of Jerusalem was brutal. But it's done and dusted thousands of years ago.
Basically, as far as I can tell, the New Testament considered that by the end of Acts the gospel HAD gone out into all the world. The temple was destroyed by AD70. What does this mean for indigenous people's not yet discovered by 'the west'? That's God's business. But as far as the bible is concerned, the gospel DID go out into the world, the end (of the temple) DID come, and so Jesus can now return at any moment - and could have for the last few thousand years. Or not. God is gracious. The game is over, God has won, but we're allowed a little overtime to play for even more points.