OK, we have seen two primary themes in Amos. The first theme is that the people have sinned against god. And chief amongst these sins is love of money, commercialism, capitalism, disregard for the poor, exploitation, etc. The second theme is the collective nature of god's punishments and rewards. For their sins, god will send the Assyrians to attack Israel, just as they were attacked by the Babylonians, the Romans and others. This affects everyone, not just the wicked. And at the end of Amos, there is the possibility of a collective restoration if the people amend their ways.
So far so good.
Now let us skip ahead to Jesus. I'm going to read between the lines, so to speak, strip away the Pauline mythology, and give you my interpretation of what he was talking about. First of all, Jesus was a Jewish apocalypticist. Apocalypticism had become a common feature by that time, with many predicting the coming of a new age. Jesus emerged from that tradition with his preaching of the coming Kingdom of god. This would be a radical break in history, with the old order giving way to the new.
What Jesus is talking about is the type of transformation, or restoration, that is mentioned at the end of Amos (9:11-15). But it is conditional upon the people amending their ways and returning to god. I have mentioned the sins that brought about god's punishment earlier. Greed, corruption, love of money, exploitation, etc. In order for the Kingdom to be actualized, they must do the opposite and abandon those sins. The capitalist collaborationists on this site claim that they merely need to be minimized, but I strongly disagree. The worship of mammon needs to be eliminated, not just kept in "proper perspective." And therefore we see in Acts (2:42-45 and 4:32-35) that the Kingdom will be a collective socialistic arrangement where the profit motive will be absent, where the last shall be first and where "justice (will) roll down like waters, and righteousness like an everflowing stream."
It is abundantly clear that this Kingdom was expected within the very near future. Within their lifetime. But it didn't happen. Jesus died. Years passed and more people died without the kingdom ever coming. So, in light of this unfulfilled expectation, Paul came along and changed everything. Instead of the Kingdom being a collective occurrence in this world, he changed it to being an individualistic one in the next world. The dynamic was altered completely.
With Jesus, the people were expected to change their ways and do the hard work necessary to build the kingdom themselves. Then god would restore his favor to them. But they didn't, so the Kingdom never came. Instead, with Paul, the Kingdom is some mystical future phenomenon that requires them to do nothing but wait. Well, it isn't coming. Revelation is a complete waste of time. As long as people continue with their love of money, commercialism, capitalism, disregard for the poor and exploitation, the Kingdom will never come. But if people displayed a little less pious faith and a greater inclination toward building a more just world, the Kingdom will become self-actualized. And they will be restored to god's favor.