I wouldn't tell people it's worth publishing. It's amateur and it actually is sort of telling people that you're not that good, so you have to make up for it by flaunting.
In any case, have you done a thousand rewrites? I've rewritten my prologue six times. My novel is being editted by my editor, and I'm going to have to take down the word count a lot. If you haven't editted yourself a thousand times over, rewritten it a thousand times, and had someone with serious skill look over it for you, then I wouldn't consider it.
In any case, if you've already had the above done, try a literary agent. Yes, it's good to put your foot in the doorway for direct publishing, but I would try an agent first. Most publishing companies want you to have one. Lit agents are free and if you have to pay them, they're frauds. They're difficult to get, but worth it. All you have to do is hone your query letter skills--and the query letter is hard! I can't tell you how many first drafts I've editted where I didn't have to fix every single sentence. Even if you get rejected through a lit agent, you'll at least know why rather than being left in the dark without one. You can find a listing of them in the Writer's Market books. You should even research your favorite books and find out the author's literary agent. The Writer's Market book doesn't have all the literary agents in it.
And I would use a better one sentence summary than the one you used above. It sounds like a hook to any other end of the world sci-fi thriller. Be more specific. Use your main character has a stepping stone and explain in one short sentence what the plot is in relations to your character.
Good luck!