system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] If Sauron wins, does Middle Earth become as Mordor? What's in it for human traitors like Wormtongue and Saruman?

As well as the Uruk-hai and the Haradrim?
gpt
Saruman is a Maiar like Gandalf and Sauron, not human. And he had no intention of ever serving Sauron. He coveted the ring and the power it would bring him. Isengard was not an ally of Mordor more than it was convenient for them to not kill each other right away.

As for the Men that served both Sauron and Saruman, they had their own goals. 

The Easterlings are traitors to the Edain and wanted land. The Haradrim were convinced by promises of riches and the natural resources they coveted in the north (Water and food, namely)

The Uruks, Orcs, Goblins, and so on are just evil. They're evil to the core. They served Sauron out of fear but hated him all the same. They're cowards, if you want to boil it down.

And the Uruk-Hai were bred to serve Saruman. They didn't have a choice.

As for the rest of Middle Earth, yes. If Sauron won there would be no green places left in the world. All of it would become as Mirkwood or Mordor. And in the end, even Tom Bombadil would die. But only at the very end.