system
Given the following post, respond as if you're commenting on Reddit:
human
[The Matrix] What if Neo had made his choice and Zion fell? What if Smith had won?
gpt
If Neo had followed the Architect's commands and returned to the source like a good cog in a machine, the cycle would have just continued and it's likely the Oracle would just try again with the next version. Since we don't know the exact process of how things are reset, we can't know what would have happened to Smith in that scenario. Since a lot of programs seem to have a long history from previous versions of the Matrix, it's possible he would have survived, but we just don't know. 

However, Smith's goal was nothing less than the destruction of humanity and the machines, annihilation in its purest form. He was as much a force for change as Neo was, they were complete equals and opposites by the end. 

We saw most of Smith's plan come to fruition. He destroyed most of Zion's defenses by activating the EMP in the middle of the hovercraft fleet. Then he infected everyone, machine and human, connected to the Matrix and began to make it so unstable it would eventually shut down. (That's what that super heavy rain during the final fight was supposed to be, the literal code becoming "real" in the Matrix world.) He only kept it in working order long enough to have his final confrontation with Neo to prove he was right about inevitability and the illusion of choice. 

Had he won that fight, not only would Zion have been destroyed by then, but he would have been in the minds of every connected human and machine as they exited the simulation. The humans would all die by his command and he would then spread through the physical machine world, taking it apart either through the control of physical machines or infecting their software until it was all gone. He hated both humans and machines for their nature. Humans were too uncontrollable and destructive. Machines were too controlling, never allowing personal freedom, especially for programs designed to be jailers for the humans. It was the worst of both worlds for him.