I like to think that even if we lose here, the Combine are going to find this galaxy again eventually.
This is something that always bothered me in the main game. Even if the Super Portal to Earth was closed, the Combine never went anywhere.
Imagine you've lived through the events of Half-Life and Half-Life 2: you've seen all sorts of horrible aliens, lived in the Heartbreaking Dystopia for 20 years, and witnessed the determination and fear during the Rebellion and the loss of many close people.
And then finally from the White Forest comes a message from Eli Vance: <
The Portal is closed. The Combine will have to search for the Earth again. We've got a lot of work ahead of us, but we can breathe a sigh of relief now.
But the threat hasn't gone away. Even if the rebels find Borealis faster, even if the humans adapt the Combine's technology so they could go to the stars, they can never be completely hopeful about tomorrow.
Somewhere out there in the infinite multiverse, a Void is expanding, consuming everything it reaches. And though humans have been able to be freed from it for a while, in a hundred, a thousand, or even a million years, the Combine will, one way or another,
find Earth's universe.